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Securities - Pledged assets (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Securities [Abstract]    
Pledged assets $ 141,000 $ 118,000
Pledged collateral for potential borrowings at the Federal Reserve Discount Window 108,000 80,000
Pledged asset, other not separately reported, potential borrowings at FHLB 5,000 6,000
Pledged securities 123,000 98,000
Pledged loans 11,000 13,000
Pledged trading assets 6,000 7,000
Pledged interest-bearing deposits 1,000 1,000
Financial instruments owned and pledged as collateral, amount eligible to be pledged by counterparty 23,000 29,000
Pledged collateral for potential borrowings at the Federal Reserve 295  
Pledged assets permitted to be sold or repledged 112,000 153,000
Market value of securities received as collateral that have been sold or repledged 80,000 107,000
Cash segregated under federal or other regulations 3,000 2,000
Securities segregated under federal or other regulations $ 4,000 $ 1,000