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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Actuarial changes        
OCI, tax expense (benefit) $ 0 $ 0 $ 1 $ 6
Prior service        
OCI, tax expense (benefit) (3) (3) (6) (11)
Other        
OCI, tax expense (benefit) $ (1) $ (1) $ (1) $ (1)