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Basis Of Presentation - New Accounting Pronouncements Not Yet Adopted (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Excess Tax Benefit from stock issued under employee stock plans $ 31
Adjustments for New Accounting Pronouncement [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Excess Tax Benefit from stock issued under employee stock plans $ (31)