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Pension and Other Postretirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in OCI) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items]      
Current year actuarial loss / (gain) $ 78 $ 6 $ 102
Current year prior service cost (credit) (156) (9) 5
Total recognized in other comprehensive income (loss) (pre-tax) $ (171) $ (52) $ 48
Amortization of actuarial losses (in years) 21 years    
Amortization of prior service credit (in years) 13 years    
Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items]      
Current year actuarial loss / (gain) $ 9    
Actuarial (loss) recognized during the year 0    
Current year prior service cost (credit) (156)    
Prior service credit (cost) recognized during the year 32    
Total recognized in other comprehensive income (loss) (pre-tax) (115)    
Total recognized in net periodic benefit costs and other comprehensive income (loss) (pre-tax) (134)    
United States Pension Benefits | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items]      
Current year actuarial loss / (gain) 0    
Actuarial (loss) recognized during the year (101)    
Current year prior service cost (credit) 0    
Prior service credit (cost) recognized during the year 0    
Total recognized in other comprehensive income (loss) (pre-tax) (101)    
Total recognized in net periodic benefit costs and other comprehensive income (loss) (pre-tax) (68)    
Foreign Pension Benefits | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items]      
Current year actuarial loss / (gain) 69    
Actuarial (loss) recognized during the year (24)    
Current year prior service cost (credit) 0    
Prior service credit (cost) recognized during the year 0    
Total recognized in other comprehensive income (loss) (pre-tax) 45    
Total recognized in net periodic benefit costs and other comprehensive income (loss) (pre-tax) $ 61