Borrowings - Summary of Activity Related to Senior Unsecured Debt Repurchases (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Debt principal repurchased	$ 2,577	$ 768
Gains (losses) on debt repurchases	$ (73)	$ (6)

Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

No definition available.

Name:	us-gaap_GainLossOnRepurchaseOfDebtInstrument
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration