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Employee Benefits (Composition of Fair Value of the Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Levels of fair value hierarchy [Line Items]    
Equity instruments $ 280 $ 264
Debt instruments 340 337
Deposits with insurance companies 28 28
Fair value of plan assets 648 629
With quoted market price [Member]    
Levels of fair value hierarchy [Line Items]    
Equity instruments 230 224
Debt instruments 337 334
Without quoted market price [Member]    
Levels of fair value hierarchy [Line Items]    
Equity instruments 50 40
Debt instruments $ 3 $ 3