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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, 2021
Dec. 31, 2020
Level 3    
Plan Assets    
Balance at beginning of period $ 360 $ 464
Foreign currency translation (1) 10
Asset returns – assets held at reporting date (19) (6)
Asset returns – assets sold during the period 43 (18)
Purchases, sales and settlements, net (165) (90)
Balance at end of period 218 360
Level 3 | Hedge funds    
Plan Assets    
Balance at beginning of period 2 43
Foreign currency translation 0 1
Asset returns – assets held at reporting date (1) 3
Asset returns – assets sold during the period 1 (12)
Purchases, sales and settlements, net (2) (33)
Balance at end of period 0 2
Level 3 | Private equity    
Plan Assets    
Balance at beginning of period 51 75
Foreign currency translation 0 2
Asset returns – assets held at reporting date (48) 6
Asset returns – assets sold during the period 39 (9)
Purchases, sales and settlements, net (35) (23)
Balance at end of period 7 51
Level 3 | Real estate – direct    
Plan Assets    
Balance at beginning of period 307 346
Foreign currency translation (1) 7
Asset returns – assets held at reporting date 30 (15)
Asset returns – assets sold during the period 3 3
Purchases, sales and settlements, net (128) (34)
Balance at end of period 211 307
Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity    
Plan Assets    
Balance at beginning of period 141  
Balance at end of period 167 141
Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets    
Plan Assets    
Balance at beginning of period 7  
Balance at end of period 7 7
Fair Value Measured at Net Asset Value Per Share | Hedge funds    
Plan Assets    
Balance at beginning of period 109  
Balance at end of period   109
Fair Value Measured at Net Asset Value Per Share | Investment funds – fixed income    
Plan Assets    
Balance at beginning of period 137  
Balance at end of period $ 137 $ 137