Derivative Financial Instruments and Hedging Activities - Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivatives, Fair Value [Line Items]
Interest expense	$ 1,396	$ 1,000
Operating expenses	458	442
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(132)	30
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	158	(82)
Interest Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	(28)	40
Operating Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	3	0
Derivatives not designated as hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Foreign currency contracts	0	0
Derivatives not designated as hedges | Operating Expense
Derivatives, Fair Value [Line Items]
Foreign currency contracts	2	0
Interest rate swaps | Fair value hedges | Derivatives designated as hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Hedged items	129	(29)
Interest rate swaps and Foreign currency swaps	(157)	46
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)	9	1
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(5)	(7)
Interest rate swaps | Cash flow hedges | Derivatives designated as hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	7	9
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)	(141)	29
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	163	(76)
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	(41)	(37)
Foreign currency swaps | Cash flow hedges | Derivatives designated as hedges | Operating Expense
Derivatives, Fair Value [Line Items]
Hedged items	178	(136)
Interest rate swaps and Foreign currency swaps	(176)	136
Interest rate contracts | Derivatives not designated as hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Interest rate contracts	33	52
Interest rate contracts | Derivatives not designated as hedges | Operating Expense
Derivatives, Fair Value [Line Items]
Interest rate contracts	$ 0	$ 0