Derivatives and Hedging Activities - Fair Value of Derivative Assets by Type (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Credit Derivatives [Line Items]
Derivative assets before collateral	$ 1,862	$ 1,735
Plus (Less): Related collateral	100	63
Total derivative assets	1,962	1,798
Interest rate
Credit Derivatives [Line Items]
Derivative assets before collateral	696	1,448
Foreign exchange
Credit Derivatives [Line Items]
Derivative assets before collateral	31	52
Commodity
Credit Derivatives [Line Items]
Derivative assets before collateral	1,108	178
Credit
Credit Derivatives [Line Items]
Derivative assets before collateral	0	(1)
Other
Credit Derivatives [Line Items]
Derivative assets before collateral	$ 27	$ 58