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Shareholders' Equity (Compensation Expense Table (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Yr
Dec. 31, 2014
USD ($)
Yr
Dec. 31, 2013
USD ($)
Share-based Compensation [Abstract]      
Equity-based compensation expense $ 106 $ 102 $ 96
Income tax benefit from equity-based compensation expense 40 39 36
Intrinsic value of options exercised and RSUs that vested during the year 170 280 102
Grant date fair value of equity-based awards that vested during the year 115 113 $ 80
Unrecognized compensation cost related to equity-based awards $ 103 $ 99  
Weighted-average life over which compensation cost is expected to be recognized, years | Yr 2.2 2.2