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Benefit Plans (Schedule of Amounts Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Retirement Benefits [Abstract]      
Amounts arising during the period $ 262 $ (67) $ (112)
Settlement 1 3 0
Reclassification adjustment relating to prior service credit 0 0 0
Reclassification adjustment relating to actuarial loss 46 45 39
Total increase (decrease) in Other comprehensive income $ 309 $ (19) $ (73)