Derivative Instruments - Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative assets	$ 1,573	$ 1,113
Derivative liabilities	9	44
Total fair value of derivative instruments	1,564	1,069
Foreign Exchange Contract \| Designated as Hedging Instrument \| Other current assets \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative assets	51	12
Foreign Exchange Contract \| Designated as Hedging Instrument \| Current assets held for sale \| Net Investment Hedging
Derivatives, Fair Value [Line Items]
Derivative assets	36	0
Foreign Exchange Contract \| Designated as Hedging Instrument \| Other assets \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative assets	26	14
Foreign Exchange Contract \| Designated as Hedging Instrument \| Other current liabilities \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative liabilities	0	17
Foreign Exchange Contract \| Not Designated as Hedging Instrument \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	26	23
Foreign Exchange Contract \| Not Designated as Hedging Instrument \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	8	25
Warrant \| Designated as Hedging Instrument \| Warrant asset \| Fair Value Hedging
Derivatives, Fair Value [Line Items]
Derivative assets	1,434	1,051
Interest Rate Contract \| Designated as Hedging Instrument \| Other assets \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative assets	0	13
Interest Rate Contract \| Designated as Hedging Instrument \| Other current liabilities \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative liabilities	1	1
Interest Rate Contract \| Designated as Hedging Instrument \| Other liabilities \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 0	$ 1

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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