Derivative Financial Instruments and Hedging Activities - Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Derivatives, Fair Value [Line Items]
Interest expense	$ 1,000	$ 577
Operating expenses	442	372
Losses to be reclassified in next twelve months	33
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	30	(55)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(82)	150
Fair value hedges \| Foreign currency translation adjustment \| Foreign currency swaps
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	0	(2)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	0	2
Cash flow hedges \| Foreign currency translation adjustment \| Foreign currency swaps
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	29	(57)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(76)	149
Cash flow hedges \| Unrealized gain (loss) on hedges \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	1	4
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(7)	(1)
Interest Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	40	(2)
Operating Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	0	0
Derivatives designated as hedges \| Interest Expense \| Fair value hedges \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Hedged items	(29)	376
Interest rate swaps and Foreign currency swaps	46	(340)
Derivatives designated as hedges \| Interest Expense \| Fair value hedges \| Foreign currency swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	0	(2)
Derivatives designated as hedges \| Interest Expense \| Cash flow hedges \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	9	2
Derivatives designated as hedges \| Interest Expense \| Cash flow hedges \| Foreign currency swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	(37)	(38)
Derivatives designated as hedges \| Operating Expense \| Fair value hedges \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	0	0
Derivatives designated as hedges \| Operating Expense \| Fair value hedges \| Foreign currency swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	23
Interest rate swaps and Foreign currency swaps	0	(24)
Derivatives designated as hedges \| Operating Expense \| Cash flow hedges \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	0	0
Derivatives designated as hedges \| Operating Expense \| Cash flow hedges \| Foreign currency swaps
Derivatives, Fair Value [Line Items]
Hedged items	(136)	160
Interest rate swaps and Foreign currency swaps	136	(160)
Derivatives not designated as hedges \| Interest Expense \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	52	0
Derivatives not designated as hedges \| Operating Expense \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	$ 0	$ 0

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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