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Benefit Plans (Amounts Recorded in Accumulated Other Comprehensive Losses) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net loss $ (2,999) $ (2,996)
Prior service (cost) credit 40 68
Deferred income taxes 767 760
Amounts recorded in accumulated other comprehensive losses (2,192) (2,168)
Pension [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net loss (2,565) (2,591)
Prior service (cost) credit (27) (34)
Deferred income taxes 670 679
Amounts recorded in accumulated other comprehensive losses (1,922) (1,946)
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net loss (389) (327)
Prior service (cost) credit 72 108
Deferred income taxes 86 61
Amounts recorded in accumulated other comprehensive losses (231) (158)
Postemployment Retirement Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net loss (45) (78)
Prior service (cost) credit (5) (6)
Deferred income taxes 11 20
Amounts recorded in accumulated other comprehensive losses $ (39) $ (64)