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Accumulated Other Comprehensive Income (Loss) - Reclassifications (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Defined Benefit Plans $ 17 $ 127 $ 30 $ 138
Tax expense of defined benefit plans $ 5 $ 34 $ 10 $ 37