Derivative Financial Instruments and Hedging Activities - Schedule of Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Derivatives, Fair Value [Line Items]
Interest expense	$ 1,597	$ 1,396
Operating expenses	513	458
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	143	(132)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(234)	158
Interest Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	(93)	(28)
Operating Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	(1)	3
Interest rate swaps \| Fair value hedges \| Derivatives designated as hedges \| Interest Expense
Derivatives, Fair Value [Line Items]
Hedged items	(321)	129
Interest rate swaps and Foreign currency swaps	251	(157)
Interest rate swaps \| Fair value hedges \| Derivatives designated as hedges \| Operating Expense
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	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)	(14)	9
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(3)	(5)
Interest rate swaps \| Cash flow hedges \| Derivatives designated as hedges \| Interest Expense
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	4	7
Interest rate swaps \| Cash flow hedges \| Derivatives designated as hedges \| Operating Expense
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	0	0
Foreign currency swaps \| Cash flow hedges \| Foreign currency translation adjustment
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	157	(141)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(231)	163
Foreign currency swaps \| Cash flow hedges \| Derivatives designated as hedges \| Interest Expense
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	(34)	(41)
Foreign currency swaps \| Cash flow hedges \| Derivatives designated as hedges \| Operating Expense
Derivatives, Fair Value [Line Items]
Hedged items	(340)	178
Interest rate swaps and Foreign currency swaps	340	(176)
Interest rate contracts \| Derivatives not designated as hedges \| Interest Expense
Derivatives, Fair Value [Line Items]
Interest rate contracts	7	33
Interest rate contracts \| Derivatives not designated as hedges \| Operating Expense
Derivatives, Fair Value [Line Items]
Interest rate contracts	0	0
Foreign currency contracts \| Derivatives not designated as hedges \| Interest Expense
Derivatives, Fair Value [Line Items]
Foreign currency contracts	0	0
Foreign currency contracts \| Derivatives not designated as hedges \| Operating Expense
Derivatives, Fair Value [Line Items]
Foreign currency contracts	$ 0	$ 2

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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