Derivative Financial Instruments and Hedging Activities - Schedule of Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivatives, Fair Value [Line Items]
Interest expense	$ 1,558	$ 1,651	$ 4,638	$ 4,886
Operating expenses	642	545	1,836	1,581
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(45)	(70)	(196)	551
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	46	33	257	(684)
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Derivatives, Fair Value [Line Items]
Total income (loss) recognized	(68)	(84)	(204)	(263)
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Derivatives, Fair Value [Line Items]
Total income (loss) recognized	0	(1)	0	(1)
Interest rate swaps \| Fair value hedges \| Derivatives designated as hedges \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating
Derivatives, Fair Value [Line Items]
Hedged items	492	(92)	537	(612)
Interest rate swaps and Foreign currency swaps	(524)	48	(645)	448
Interest rate swaps \| Fair value hedges \| Derivatives designated as hedges \| Income Statement Location [Axis]: us-gaap:OperatingExpenses
Derivatives, Fair Value [Line Items]
Hedged items	0	0	0	0
Interest rate swaps and Foreign currency swaps	0	0	0	0
Interest rate swaps \| Cash flow hedges \| Unrealized gain (loss) on hedges
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(1)	(2)	4	(26)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	3	(3)	4	(9)
Interest rate swaps \| Cash flow hedges \| Derivatives designated as hedges \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	(5)	3	(8)	11
Interest rate swaps \| Cash flow hedges \| Derivatives designated as hedges \| Income Statement Location [Axis]: us-gaap:OperatingExpenses
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	0	0	0	0
Foreign currency swaps \| Cash flow hedges \| Foreign currency translation adjustments
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(43)	(68)	(200)	578
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	42	36	253	(675)
Foreign currency swaps \| Cash flow hedges \| Derivatives designated as hedges \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating
Derivatives, Fair Value [Line Items]
Hedged items	0	0	0	0
Interest rate swaps and Foreign currency swaps	(26)	(27)	(81)	(78)
Foreign currency swaps \| Cash flow hedges \| Derivatives designated as hedges \| Income Statement Location [Axis]: us-gaap:OperatingExpenses
Derivatives, Fair Value [Line Items]
Hedged items	30	21	254	(971)
Interest rate swaps and Foreign currency swaps	(30)	(22)	(254)	970
Interest rate contracts \| Derivatives not designated as hedges \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating
Derivatives, Fair Value [Line Items]
Interest rate contracts	(4)	(17)	(7)	(31)
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Derivatives, Fair Value [Line Items]
Interest rate contracts	0	0	0	0
Foreign currency contracts \| Derivatives not designated as hedges \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating
Derivatives, Fair Value [Line Items]
Foreign currency contracts	0	0	0	0
Foreign currency contracts \| Derivatives not designated as hedges \| Income Statement Location [Axis]: us-gaap:OperatingExpenses
Derivatives, Fair Value [Line Items]
Foreign currency contracts	$ 0	$ 0	$ 0	$ 0

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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