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Benefit Plans (Amounts Recorded in Accumulated Other Comprehensive Losses) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net (loss) gain $ (2,086) $ (2,256)
Prior service (cost) credit 198 233
Deferred income taxes 496 530
Amounts recorded in accumulated other comprehensive losses (1,392) (1,493)
Pension [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net (loss) gain (2,213) (2,236)
Prior service (cost) credit (13) (18)
Deferred income taxes 578 585
Amounts recorded in accumulated other comprehensive losses (1,648) (1,669)
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net (loss) gain 172 19
Prior service (cost) credit 216 256
Deferred income taxes (95) (67)
Amounts recorded in accumulated other comprehensive losses 293 208
Postemployment Retirement Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net (loss) gain (45) (39)
Prior service (cost) credit (5) (5)
Deferred income taxes 13 12
Amounts recorded in accumulated other comprehensive losses $ (37) $ (32)