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Benefit Plans (Schedule of amounts recognized in Other comprehensive income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Amounts arising during the period $ (112) $ (41) $ (31)
Settlement 0 6 9
Reclassification adjustment relating to prior service credit 0 (2) (2)
Reclassification adjustment relating to actuarial loss 39 36 35
Total increase (decrease) in Other comprehensive income $ (73) $ (1) $ 11