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Employee Benefits (Composition of Employee Benefits) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Notes to Consolidated Financial Statements [Abstract]    
Fair value of plan assets $ 629 $ 583
Termination benefits (158) (105)
Defined benefit obligation (1,075) (1,004)
Total Employee benefits $ (604) $ (526)