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Employee Benefits (Composition of Employee Benefits) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Notes to Consolidated Financial Statements [Abstract]    
Fair value of plan assets $ 518 $ 631
Termination benefits (111) (142)
Defined benefit obligation (860) (1,068)
Total Employee benefits $ (453) $ (579)