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Share-Based Compensation Plans - Other information related to the company's share options (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Aggregate intrinsic value of stock options exercised $ 1 $ 3 $ 18 $ 103
Cash received from the exercise of stock options 0 1 11 39
Tax benefit realized from the exercise of stock options $ 1 $ 1 $ 5 $ 36