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Employee Benefits (Composition of Fair Value of the Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Levels of fair value hierarchy [Line Items]    
Debt instruments $ 283 $ 324
Deposits with insurance companies 35 110
Fair value of plan assets 518 631
With quoted market price [Member]    
Levels of fair value hierarchy [Line Items]    
Equity instruments 200 197
Debt instruments 164 179
Without quoted market price [Member]    
Levels of fair value hierarchy [Line Items]    
Debt instruments $ 119 $ 145