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Benefit Plans (Schedule of amounts recognized in Other comprehensive income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Amounts arising during the period $ (67) $ (112) $ (41)
Settlement 3 0 6
Reclassification adjustment relating to prior service credit 0 0 (2)
Reclassification adjustment relating to actuarial loss 45 39 36
Total increase (decrease) in Other comprehensive income $ (19) $ (73) $ (1)