Debt - Summary of Debt (Detail) - USD ($) |
Jun. 30, 2025 |
Dec. 31, 2024 |
Jun. 30, 2024 |
May 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2020 |
Oct. 31, 2018 |
Mar. 31, 2018 |
Apr. 30, 2017 |
Aug. 31, 2016 |
Jan. 31, 2015 |
Apr. 30, 2014 |
Nov. 30, 2002 |
Mar. 31, 1999 |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt | [1] | $ 6,895,000,000 | $ 6,893,000,000 | $ 6,891,000,000 | ||||||||||||
| Fair value | 6,294,000,000 | 6,173,000,000 | 6,166,000,000 | |||||||||||||
| Senior Notes 2.45% Due 2027 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 500,000,000 | |||||||||||||||
| Debt, stated interest rate | 2.45% | |||||||||||||||
| Long-term debt | 499,000,000 | 499,000,000 | 499,000,000 | |||||||||||||
| Fair value | 488,000,000 | 479,000,000 | 469,000,000 | |||||||||||||
| Senior Notes 2.50% Due 2027 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 500,000,000 | |||||||||||||||
| Debt, stated interest rate | 2.50% | |||||||||||||||
| Long-term debt | 499,000,000 | 499,000,000 | 498,000,000 | |||||||||||||
| Fair value | 487,000,000 | 479,000,000 | 468,000,000 | |||||||||||||
| Senior Notes 6.625% Due 2029 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 300,000,000 | |||||||||||||||
| Debt, stated interest rate | 6.625% | |||||||||||||||
| Long-term debt | 298,000,000 | 298,000,000 | 298,000,000 | |||||||||||||
| Fair value | 324,000,000 | 320,000,000 | 321,000,000 | |||||||||||||
| Senior Notes 4.00% Due 2029 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 550,000,000 | |||||||||||||||
| Debt, stated interest rate | 4.00% | |||||||||||||||
| Long-term debt | 548,000,000 | 547,000,000 | 547,000,000 | |||||||||||||
| Fair value | 547,000,000 | 534,000,000 | 527,000,000 | |||||||||||||
| Senior Notes 3.20% Due 2030 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 500,000,000 | |||||||||||||||
| Debt, stated interest rate | 3.20% | |||||||||||||||
| Long-term debt | 498,000,000 | 498,000,000 | 497,000,000 | |||||||||||||
| Fair value | 477,000,000 | 462,000,000 | 455,000,000 | |||||||||||||
| Senior Notes 3.00% Due 2032 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 500,000,000 | |||||||||||||||
| Debt, stated interest rate | 3.00% | |||||||||||||||
| Long-term debt | 497,000,000 | 497,000,000 | 497,000,000 | |||||||||||||
| Fair value | 456,000,000 | 439,000,000 | 434,000,000 | |||||||||||||
| Senior Notes 6.25% Due 2032 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 400,000,000 | |||||||||||||||
| Debt, stated interest rate | 6.25% | |||||||||||||||
| Long-term debt | 397,000,000 | 397,000,000 | 397,000,000 | |||||||||||||
| Fair value | 438,000,000 | 430,000,000 | 428,000,000 | |||||||||||||
| Senior Notes 4.95% Due 2033 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 500,000,000 | |||||||||||||||
| Debt, stated interest rate | 4.95% | |||||||||||||||
| Long-term debt | 497,000,000 | 497,000,000 | 497,000,000 | |||||||||||||
| Fair value | 511,000,000 | 495,000,000 | 495,000,000 | |||||||||||||
| Senior Notes 4.35% Due 2044 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 350,000,000 | |||||||||||||||
| Debt, stated interest rate | 4.35% | |||||||||||||||
| Long-term debt | 347,000,000 | 347,000,000 | 347,000,000 | |||||||||||||
| Fair value | 299,000,000 | 298,000,000 | 301,000,000 | |||||||||||||
| Senior Notes 3.70% Due 2045 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 400,000,000 | |||||||||||||||
| Debt, stated interest rate | 3.70% | |||||||||||||||
| Long-term debt | 396,000,000 | 396,000,000 | 396,000,000 | |||||||||||||
| Fair value | 310,000,000 | 308,000,000 | 310,000,000 | |||||||||||||
| Senior Notes 4.125% Due 2047 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 850,000,000 | |||||||||||||||
| Debt, stated interest rate | 4.125% | |||||||||||||||
| Long-term debt | 843,000,000 | 842,000,000 | 842,000,000 | |||||||||||||
| Fair value | 699,000,000 | 684,000,000 | 699,000,000 | |||||||||||||
| Senior Notes 4.20% Due 2048 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 600,000,000 | |||||||||||||||
| Debt, stated interest rate | 4.20% | |||||||||||||||
| Long-term debt | 591,000,000 | 591,000,000 | 591,000,000 | |||||||||||||
| Fair value | 493,000,000 | 490,000,000 | 494,000,000 | |||||||||||||
| Senior Notes 3.95% Due 2050 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 500,000,000 | |||||||||||||||
| Debt, stated interest rate | 3.95% | |||||||||||||||
| Long-term debt | 491,000,000 | 491,000,000 | 491,000,000 | |||||||||||||
| Fair value | 392,000,000 | 386,000,000 | 392,000,000 | |||||||||||||
| Senior Notes 3.70% Due 2052 | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Debt, face amount | $ 500,000,000 | |||||||||||||||
| Debt, stated interest rate | 3.70% | |||||||||||||||
| Long-term debt | 494,000,000 | 494,000,000 | 494,000,000 | |||||||||||||
| Fair value | $ 373,000,000 | $ 369,000,000 | $ 373,000,000 | |||||||||||||
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