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Debt - Prime Notes (Details) - Prime Notes - Secured Debt - USD ($) $ in Millions	1 Months Ended
	Feb. 29, 2020	Apr. 30, 2019	Feb. 28, 2019	Feb. 28, 2018	Dec. 31, 2021
Debt Disclosure [Abstract]
Debt instrument, face amount	$ 1,200				$ 3,100
Debt Instrument [Line Items]
Debt instrument, face amount	1,200				$ 3,100
Repayments of debt	1,300	$ 1,100	$ 319	$ 649
Debt instrument, repurchased face amount	$ 1,200	$ 1,000	$ 300	$ 594

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Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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