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Pension and Other Postretirement Benefits (Schedule of Reconciliation of Plan Assets Measured by Significant Unobservable Inputs) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Level 3    
Plan Assets    
Balance at beginning of period $ 464 $ 533
Foreign currency translation 10 16
Asset returns – assets held at reporting date (6) (3)
Asset returns – assets sold during the period (18) 30
Purchases, sales and settlements, net (90) (112)
Balance at end of period 360 464
Level 3 | Hedge funds    
Plan Assets    
Balance at beginning of period 43 113
Foreign currency translation 1 4
Asset returns – assets held at reporting date 3 (6)
Asset returns – assets sold during the period (12) 7
Purchases, sales and settlements, net (33) (75)
Balance at end of period 2 43
Level 3 | Private equity    
Plan Assets    
Balance at beginning of period 75 103
Foreign currency translation 2 4
Asset returns – assets held at reporting date 6 (22)
Asset returns – assets sold during the period (9) 17
Purchases, sales and settlements, net (23) (27)
Balance at end of period 51 75
Level 3 | Defined Benefit Plan, Real Estate    
Plan Assets    
Balance at beginning of period 346 317
Foreign currency translation 7 8
Asset returns – assets held at reporting date (15) 25
Asset returns – assets sold during the period 3 6
Purchases, sales and settlements, net (34) (10)
Balance at end of period 307 346
Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity    
Plan Assets    
Balance at beginning of period 96  
Balance at end of period 141 96
Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets    
Plan Assets    
Balance at beginning of period 23  
Balance at end of period 7 23
Fair Value Measured at Net Asset Value Per Share | Hedge funds    
Plan Assets    
Balance at beginning of period 328  
Balance at end of period 109 328
Fair Value Measured at Net Asset Value Per Share | Investment funds – fixed income    
Plan Assets    
Balance at beginning of period 193  
Balance at end of period $ 137 $ 193