Derivative Financial Instruments and Hedging Activities - Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivatives, Fair Value [Line Items]
Interest expense	$ 1,240	$ 764	$ 3,374	$ 1,984
Operating expenses	461	436	1,359	1,202
Loss to be reclassified in next twelve months			20
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(139)	(384)	(69)	(825)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	219	383	107	940
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)	(154)	(383)	(81)	(832)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	226	386	129	944
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)	15	(1)	12	9
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income (Loss)	(7)	(3)	(22)	(6)
Interest Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	11	(2)	63	4
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	327	346	443	1,023
Interest rate swaps and Foreign currency swaps	(334)	(341)	(454)	(963)
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	4	29	9
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	(40)	(42)	(114)	(123)
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	260	470	60	1,129
Interest rate swaps and Foreign currency swaps	(260)	(470)	(60)	(1,129)
Derivatives not designated as hedges | Interest Expense | Interest rate contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	48	31	158	59
Derivatives not designated as hedges | Operating Expense | Interest rate contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	$ 0	$ 0	$ 0	$ 0