Securities Financing Activities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Short-term Debt	$ 5,292	$ 6,092
Securities Sold under Agreements to Repurchase
Offsetting Liabilities [Line Items]
Short-term Debt	2,435	1,221
Securities Sold under Agreements to Repurchase | U.S. Treasury
Offsetting Liabilities [Line Items]
Short-term Debt	1,158	336
Securities Sold under Agreements to Repurchase | GSE
Offsetting Liabilities [Line Items]
Short-term Debt	78	54
Securities Sold under Agreements to Repurchase | Agency MBS - residential
Offsetting Liabilities [Line Items]
Short-term Debt	861	448
Securities Sold under Agreements to Repurchase | Corporate and other debt securities
Offsetting Liabilities [Line Items]
Short-term Debt	338	383
Securities Sold under Agreements to Repurchase | Overnight and Continuous
Offsetting Liabilities [Line Items]
Short-term Debt	1,735	996
Securities Sold under Agreements to Repurchase | Overnight and Continuous | U.S. Treasury
Offsetting Liabilities [Line Items]
Short-term Debt	749	305
Securities Sold under Agreements to Repurchase | Overnight and Continuous | GSE
Offsetting Liabilities [Line Items]
Short-term Debt	53	45
Securities Sold under Agreements to Repurchase | Overnight and Continuous | Agency MBS - residential
Offsetting Liabilities [Line Items]
Short-term Debt	720	442
Securities Sold under Agreements to Repurchase | Overnight and Continuous | Corporate and other debt securities
Offsetting Liabilities [Line Items]
Short-term Debt	213	204
Securities Sold under Agreements to Repurchase | Up to 30 days
Offsetting Liabilities [Line Items]
Short-term Debt	700	225
Securities Sold under Agreements to Repurchase | Up to 30 days | U.S. Treasury
Offsetting Liabilities [Line Items]
Short-term Debt	409	31
Securities Sold under Agreements to Repurchase | Up to 30 days | GSE
Offsetting Liabilities [Line Items]
Short-term Debt	25	9
Securities Sold under Agreements to Repurchase | Up to 30 days | Agency MBS - residential
Offsetting Liabilities [Line Items]
Short-term Debt	141	6
Securities Sold under Agreements to Repurchase | Up to 30 days | Corporate and other debt securities
Offsetting Liabilities [Line Items]
Short-term Debt	$ 125	$ 179