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Securities - Pledged assets (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Securities [Abstract]    
Pledged assets $ 141,000 $ 141,000
Pledged collateral for potential borrowings at the Federal Reserve Discount Window 110,000 113,000
Pledged asset, other not separately reported, potential borrowings at FHLB 7,000 5,000
Pledged securities 123,000 124,000
Pledged loans 12,000 11,000
Pledged trading assets 5,000 6,000
Pledged interest-bearing deposits (less than) 1,000 1,000
Financial instruments owned and pledged as collateral, amount eligible to be pledged by counterparty 23,000 18,000
Pledged assets permitted to be sold or repledged 119,000 121,000
Market value of securities received as collateral that have been sold or repledged 71,000 84,000
Cash segregated under federal or other regulations 4,201 3,167
Securities segregated under federal or other regulations $ 3,000 $ 6,000