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Basis Of Presentation Adoption of New Accounting Standards (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Excess Tax Benefit from stock issued under employee stock plans $ (8) $ (48) $ (31)