Debt - Schedule of Issuances and Borrowings (Details) - USD ($)
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12 Months Ended |
Dec. 18, 2025 |
Nov. 28, 2025 |
Oct. 09, 2025 |
Aug. 06, 2025 |
Aug. 05, 2025 |
Mar. 27, 2025 |
Mar. 17, 2025 |
Feb. 27, 2025 |
Feb. 11, 2025 |
Dec. 31, 2025 |
| Debt Instrument [Line Items] |
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| Principal Issuances |
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$ 13,827,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(161,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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12,013,000,000
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| UScellular Wireless Assets Operations | Master License Agreement |
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| Debt Instrument [Line Items] |
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| Principal Issuances |
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$ 1,700,000,000
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| Senior Notes |
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| Debt Instrument [Line Items] |
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| Principal Issuances |
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10,827,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(103,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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9,071,000,000
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| ABS Notes |
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| Debt Instrument [Line Items] |
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| Principal Issuances |
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1,000,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(4,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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996,000,000
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| Loans Payable |
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| Debt Instrument [Line Items] |
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| Principal Issuances |
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2,000,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(54,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 1,946,000,000
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| 3.150% Senior Notes due 2032 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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3.15%
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| Principal Issuances |
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$ 1,036,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(5,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 1,031,000,000
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| 3.500% Senior Notes due 2037 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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3.50%
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| Principal Issuances |
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$ 1,036,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(8,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 1,028,000,000
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| 3.800% Senior Notes due 2045 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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3.80%
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| Principal Issuances |
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$ 777,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(7,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 770,000,000
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| 5.125% Senior Notes due 2032 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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5.125%
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5.125%
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| Principal Issuances |
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$ 1,250,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(7,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 1,243,000,000
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| 5.300% Senior Notes due 2035 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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5.30%
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5.30%
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| Principal Issuances |
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$ 1,000,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(7,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 993,000,000
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| 5.875% Senior Notes due 2055 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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5.875%
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5.875%
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| Principal Issuances |
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$ 1,250,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(15,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 1,235,000,000
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| 6.700% Senior Notes due 2033 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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6.70%
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6.70%
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| Principal Issuances |
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$ 489,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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56,000,000
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 0
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| 6.250% Senior Notes due 2069 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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6.25%
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6.25%
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| Principal Issuances |
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$ 393,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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3,000,000
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 0
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| 5.500% Senior Notes due March 2070 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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5.50%
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5.50%
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| Principal Issuances |
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$ 401,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(42,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 0
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| 5.500% Senior Notes due June 2070 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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5.50%
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5.50%
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| Principal Issuances |
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$ 395,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(42,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 0
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| 4.625% Senior Notes due 2033 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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4.625%
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4.625%
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| Principal Issuances |
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$ 800,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(5,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 795,000,000
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| 4.950% Senior Notes due 2035 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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4.95%
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4.95%
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| Principal Issuances |
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$ 1,000,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(9,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 991,000,000
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| 5.700% Senior Notes due 2056 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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5.70%
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5.70%
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| Principal Issuances |
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$ 1,000,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(15,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 985,000,000
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| 4.740% Class A Senior ABS Notes due 2029 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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4.74%
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| 4.740% Class A Senior ABS Notes due 2029 | ABS Notes due 2029 |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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4.74%
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| Principal Issuances |
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$ 500,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(2,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 498,000,000
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| 4.340% Class A Senior ABS Notes due 2030 | Senior Notes |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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4.34%
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| 4.340% Class A Senior ABS Notes due 2030 | ABS Notes Due 2030 |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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4.34%
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| Principal Issuances |
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$ 500,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(2,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 498,000,000
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| 4.927% ECA Facility due March 2036 | Loans Payable |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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4.927%
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| Principal Issuances |
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$ 1,000,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(30,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 970,000,000
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| ECA Facility due November 2036 1 | Loans Payable |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
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4.502%
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| Principal Issuances |
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$ 500,000,000
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| Discounts/Premiums and Issuance Costs, Net |
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(13,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
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$ 487,000,000
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| ECA Facility due November 2036 2 | Loans Payable |
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| Debt Instrument [Line Items] |
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| Interest rate, stated percentage |
4.392%
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| Principal Issuances |
$ 500,000,000
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| Discounts/Premiums and Issuance Costs, Net |
(11,000,000)
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| Net Proceeds from Issuance of Long-Term Debt |
$ 489,000,000
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