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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Unrealized gains (losses) arising during the period, tax expense $ 9 $ (3) $ 16 $ (11)
Unrealized (losses) gains arising during the period, tax (benefit) expense (4) 1 (6) 2
Reclassification adjustment for (gains) losses included in net income, tax expense 0 0 0 0
Unrealized gains (losses) arising during the period, tax expense $ 0 $ 0 $ 0 $ 0