Stock-Based Compensation (Incentive Equity Awards Granted By The Company) (Details) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Units, Beginning Balance (shares)	1.6
Number of Units, Granted (shares)	0.9
Number of Units, Vested/exercised (shares)	(0.7)
Number of Units, Ending Balance (shares)	1.8
Weighted Average Grant Price, Beginning Balance (in dollars per share) | $ / shares	$ 73.75
Weighted Average Grant Price, Granted (in dollars per share) | $ / shares	71.65
Weighted Average Grant Price, Vested/exercised (in dollars per share) | $ / shares	65.46
Weighted Average Grant Price, Ending Balance (in dollars per share) | $ / shares	$ 75.84
Shares outstanding, expected to vest	1.7
PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Units, Beginning Balance (shares)	0.6
Number of Units, Granted (shares)	0.2
Number of Units, Vested/exercised (shares)	(0.2)
Number of Units, Ending Balance (shares)	0.6
Weighted Average Grant Price, Beginning Balance (in dollars per share) | $ / shares	$ 73.60
Weighted Average Grant Price, Granted (in dollars per share) | $ / shares	71.65
Weighted Average Grant Price, Vested/exercised (in dollars per share) | $ / shares	60.24
Weighted Average Grant Price, Ending Balance (in dollars per share) | $ / shares	$ 77.84
Unrecognized compensation expense, maximum | $	$ 27
Incentive equity awards vesting ratably over a period, in years	2 years
SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Units, Beginning Balance (shares)	0.8
Number of Units, Granted (shares)	0.1
Number of Units, Vested/exercised (shares)	(0.3)
Number of Units, Ending Balance (shares)	0.6
Weighted Average Grant Price, Vested/exercised (in dollars per share) | $ / shares	$ 27.84
Weighted Average Exercise Price, Beginning Balance (in dollars per share) | $ / shares	46.45
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares	$ 71.65
Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares	61.52
Shares outstanding, expected to vest	0.4
Shares, intrinsic value | $	$ 7
Weighted average remaining contractual life, years	3 years 1 month
RSUs and SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unrecognized compensation expense, maximum | $	$ 109
Incentive equity awards vesting ratably over a period, in years	2 years 8 months