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Fair Value Measurements - Reconciliation of Assets and Liabilities Measured at Recurring L3 Fair Value (Parenthetical) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]            
Derivative assets $ 1,085 $ 1,190 $ 991 $ 961 $ 901 $ 861
Interest Rates            
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]            
Derivative assets 14     11    
Derivative liabilities $ 9     $ 7