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Securities - Pledged assets (Details) - USD ($)
$ in Billions
Jun. 30, 2020
Dec. 31, 2019
Securities [Abstract]    
Pledged assets $ 139.0 $ 118.0
Pledged collateral for potential borrowings at the Federal Reserve Discount Window 109.0 80.0
Pledged asset, other not separately reported, potential borrowings at FHLB 6.0 6.0
Pledged securities 121.0 98.0
Pledged loans 12.0 13.0
Pledged trading assets 5.0 7.0
Pledged interest-bearing deposits 1.0 1.0
Financial instruments owned and pledged as collateral, amount eligible to be pledged by counterparty 21.0 29.0
Pledged collateral for potential borrowings at the Federal Reserve 1.5  
Pledged assets permitted to be sold or repledged 107.0 153.0
Market value of securities received as collateral that have been sold or repledged 72.0 107.0
Cash segregated under federal or other regulations 2.0 2.0
Securities segregated under federal or other regulations $ 6.0 $ 1.0