Derivative Financial Instruments and Hedging Activities - Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivatives, Fair Value [Line Items]
Interest expense	$ 1,485	$ 1,135	$ 2,881	$ 2,134
Operating expenses	479	456	937	899
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(57)	40	(189)	70
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	48	(29)	206	(111)
Interest Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	(56)	12	(84)	52
Operating Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	(2)	0	1	0
Interest rate swaps \| Fair value hedges \| Derivatives designated as hedges \| Interest Expense
Derivatives, Fair Value [Line Items]
Hedged items	62	145	192	116
Interest rate swaps and Foreign currency swaps	(130)	(165)	(287)	(120)
Interest rate swaps \| Fair value hedges \| Derivatives designated as hedges \| Operating Expense
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)	17	(5)	26	(4)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(2)	(8)	(7)	(15)
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	10	11	19
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	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)	(74)	45	(215)	73
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	49	(21)	212	(96)
Foreign currency swaps \| Cash flow hedges \| Derivatives designated as hedges \| Interest Expense
Derivatives, Fair Value [Line Items]
Hedged items	0	0	0	0
Interest rate swaps and Foreign currency swaps	(34)	(37)	(75)	(74)
Foreign currency swaps \| Cash flow hedges \| Derivatives designated as hedges \| Operating Expense
Derivatives, Fair Value [Line Items]
Hedged items	30	(64)	208	(200)
Interest rate swaps and Foreign currency swaps	(30)	64	(206)	200
Interest rate contracts \| Derivatives not designated as hedges \| Interest Expense
Derivatives, Fair Value [Line Items]
Interest rate contracts	42	59	75	110
Interest rate contracts \| Derivatives not designated as hedges \| Operating Expense
Derivatives, Fair Value [Line Items]
Interest rate contracts	0	0	0	0
Foreign currency contracts \| Derivatives not designated as hedges \| Interest Expense
Derivatives, Fair Value [Line Items]
Foreign currency contracts	0	0	0	0
Foreign currency contracts \| Derivatives not designated as hedges \| Operating Expense
Derivatives, Fair Value [Line Items]
Foreign currency contracts	$ (2)	$ 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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