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Retirement Programs - Changes In Plan Assets and Benefit Obligations Recognized in OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pensions    
Defined Benefit Plan Disclosure [Line Items]    
Current year net actuarial losses (gains)* $ 598 $ 834
Amortization of net actuarial gains (losses) (89) (59)
Plan amendment 7 (4)
Amortization of prior service credits (costs) (1) (2)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement Gain (Loss), before Tax (6) (97)
Other Comprehensive Income (Loss), Defined Benefit Plan, Curtailment Gain (Loss), before Tax (1) 0
Foreign currency translation and other changes 87 12
Total Recognized in Other Comprehensive Income 595 684
OPEB    
Defined Benefit Plan Disclosure [Line Items]    
Current year net actuarial losses (gains)* (2) 8
Amortization of net actuarial gains (losses) 2 3
Plan amendment (13)  
Amortization of prior service credits (costs) 2 1
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement Gain (Loss), before Tax 0 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Curtailment Gain (Loss), before Tax 0 2
Foreign currency translation and other changes (1)  
Total Recognized in Other Comprehensive Income $ (12) $ 14