Derivative Financial Instruments and Hedging Activities - Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivatives, Fair Value [Line Items]
Interest expense	$ 1,135	$ 642	$ 2,134	$ 1,219
Operating expenses	456	393	899	766
Loss to be reclassified in next twelve months			46
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	40	(386)	70	(441)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(29)	406	(111)	557
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	0	0	(2)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	0	0	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)	45	(392)	73	(449)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(21)	408	(96)	557
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)	(5)	6	(4)	10
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(8)	(2)	(15)	(3)
Interest Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	12	8	52	5
Operating Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	0	0	0	0
Derivatives designated as hedges | Interest Expense | Fair value hedges | Interest rate swaps
Derivatives, Fair Value [Line Items]
Hedged items	145	301	116	677
Interest rate swaps and Foreign currency swaps	(165)	(282)	(120)	(622)
Derivatives designated as hedges | Interest Expense | Fair value hedges | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0	0	0
Interest rate swaps and Foreign currency swaps	0	0	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	10	3	19	5
Derivatives designated as hedges | Interest Expense | Cash flow hedges | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0	0	0
Interest rate swaps and Foreign currency swaps	(37)	(42)	(74)	(81)
Derivatives designated as hedges | Operating Expense | Fair value hedges | Interest rate swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0	0	0
Interest rate swaps and Foreign currency swaps	0	0	0	0
Derivatives designated as hedges | Operating Expense | Fair value hedges | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0	0	23
Interest rate swaps and Foreign currency swaps	0	0	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	0	0
Derivatives designated as hedges | Operating Expense | Cash flow hedges | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Hedged items	(64)	499	(200)	659
Interest rate swaps and Foreign currency swaps	64	(499)	200	(659)
Derivatives not designated as hedges | Interest Expense | Interest rate contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	59	28	110	28
Derivatives not designated as hedges | Operating Expense | Interest rate contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	$ 0	$ 0	$ 0	$ 0