Derivative Financial Instruments and Hedging Activities - Income (Losses) Recognized in Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Derivatives, Fair Value [Line Items]
Interest expense	$ 577	$ 650
Operating expenses	372	411
AOCI Attributable to Parent
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(55)	(123)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income	150	172
Fair Value Hedging \| Foreign currency translation adjustment \| Foreign Currency Swaps
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(2)	(3)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income	2	3
Cash Flow Hedging \| Foreign currency translation adjustment \| Foreign Currency Swaps
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	(57)	(125)
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income	149	166
Cash Flow Hedging \| Unrealized gain (loss) on hedges \| Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Gains (Losses) Recognized In Accumulated Other Comprehensive Income (Loss)	4	5
(Gains) Losses Reclassified From Accumulated Other Comprehensive Income (Loss) Into Income	(1)	3
Interest Expense
Derivatives, Fair Value [Line Items]
Total income (losses) recognized	(2)	(3)
Operating Expense
Derivatives, Fair Value [Line Items]
Total income (losses) recognized	0	1
Designated as Hedging Instrument \| Interest Expense \| Fair Value Hedging \| Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Hedged items	376	352
Interest rate swaps and Foreign currency swaps	(340)	(335)
Designated as Hedging Instrument \| Interest Expense \| Fair Value Hedging \| Foreign Currency Swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	(2)	(5)
Designated as Hedging Instrument \| Interest Expense \| Cash Flow Hedging \| Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	2	(5)
Designated as Hedging Instrument \| Interest Expense \| Cash Flow Hedging \| Foreign Currency Swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	(38)	(30)
Designated as Hedging Instrument \| Operating Expense \| Fair Value Hedging \| Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Hedged items	0	0
Interest rate swaps and Foreign currency swaps	0	0
Designated as Hedging Instrument \| Operating Expense \| Fair Value Hedging \| Foreign Currency Swaps
Derivatives, Fair Value [Line Items]
Hedged items	23	77
Interest rate swaps and Foreign currency swaps	(24)	(76)
Designated as Hedging Instrument \| Operating Expense \| Cash Flow Hedging \| Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Interest rate swaps and Foreign currency swaps	0	0
Designated as Hedging Instrument \| Operating Expense \| Cash Flow Hedging \| Foreign Currency Swaps
Derivatives, Fair Value [Line Items]
Hedged items	160	190
Interest rate swaps and Foreign currency swaps	(160)	(190)
Not Designated as Hedging Instrument \| Interest Expense \| Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	0	20
Not Designated as Hedging Instrument \| Operating Expense \| Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Interest rate contracts	$ 0	$ 0

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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