Derivative Financial Instruments and Hedging Activities - Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivatives, Fair Value [Line Items]
Interest expense	$ 642	$ 633	$ 1,219	$ 1,283
Operating expenses	393	378	766	789
Gains to be reclassified in next twelve months			51
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(386)	(6)	(441)	(129)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income	406	(1)	557	171
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	(1)	(2)	(4)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income	0	1	2	4
Cash flow hedges \| Foreign currency translation adjustment \| Foreign currency swaps
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(392)	(6)	(449)	(131)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income	408	(6)	557	160
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)	6	1	10	6
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income	(2)	4	(3)	7
Interest Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	8	(9)	5	(12)
Operating Expense
Derivatives, Fair Value [Line Items]
Total income (loss) recognized	0	3	0	4
Derivatives designated as hedges \| Interest Expense \| Fair value hedges \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Hedged items	301	(107)	677	245
Interest rate swaps and Foreign currency swaps	(282)	118	(622)	(217)
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	(4)	(2)	(9)
Derivatives designated as hedges \| Interest Expense \| Cash flow hedges \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	3	(5)	5	(10)
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	(42)	(30)	(81)	(60)
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	(45)	23	32
Interest rate swaps and Foreign currency swaps	0	48	(24)	(28)
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	499	(38)	659	152
Interest rate swaps and Foreign currency swaps	(499)	38	(659)	(152)
Derivatives not designated as hedges \| Interest Expense \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	28	19	28	39
Derivatives not designated as hedges \| Operating Expense \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	$ 0	$ 0	$ 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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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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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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Amount of the cost of borrowed funds accounted for as interest expense.

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