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Employee Benefits (Composition of Employee Benefits) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Notes to Consolidated Financial Statements [Abstract]    
Fair value of plan assets $ 631 $ 552
Termination benefits (142) (147)
Defined benefit obligation (1,068) (934)
Total Employee benefits $ (579) $ (529)