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Retirement Plans (Reconciliation of The Change In AOCL For Defined-Benefit Retirement Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Amortization of:      
Change in AOCL, pretax $ (2,365) $ 453 $ 857
Pension Benefits      
Compensation And Retirement Disclosure Line Items      
Net actuarial (gain) loss (1,684) 863  
Prior service credit (3) (38)  
Amortization of:      
Net actuarial (loss) gain from prior years (352) (387)  
Prior service credit 20 18  
Settlement/curtailment/other (77) 0  
Change in AOCL, pretax (2,096) 456  
Other  Post-retirement Benefits      
Compensation And Retirement Disclosure Line Items      
Net actuarial (gain) loss (265) (6)  
Prior service credit (4) (1)  
Amortization of:      
Net actuarial (loss) gain from prior years 0 3  
Prior service credit 0 1  
Settlement/curtailment/other 0 0  
Change in AOCL, pretax $ (269) $ (3)