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FAIR VALUE MEASUREMENTS - Schedule of Level 3 Instruments (Details) - Level 3 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation    
Unrealized net gains and losses $ 404 $ (231)
Investment securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation    
Balance at beginning of period 4,013 4,109
Net realized/unrealized gains (losses) included in earnings 399 (231)
Purchases 2,159 729
Sales & Settlements (1,308) (333)
Transfers into Level 3 0 2
Transfers out of Level 3 (53) (262)
Balance at end of period 5,210 4,013
U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation    
Purchases $ 975 $ 615