Common Stock - Additional Information (Details) - USD ($)		1 Months Ended			3 Months Ended		27 Months Ended
	Feb. 01, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016	Oct. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation, effect on earnings per share, basic (in dollars per share)					$ 0	$ 0
Share-based compensation, effect on earnings per share, diluted (in dollars per share)					$ 0	$ 0
Share-based Compensation					$ 9,000,000	$ 7,000,000
Tax benefit from options exercised					2,000,000	1,000,000
Total fair value of shares vested					$ 2,000,000	2,000,000
Treasury stock repurchased		11,895,938			11,895,938		11,895,938	11,655,938
Dividend declared (in dollars per share)	$ 0.25
Annual divided declared (in dollars per share)	$ 1.00
Dividend paid (in dollars per share)		$ 0.25
Cash dividends paid		$ 13,000,000			$ 13,000,000	0
Equity Option
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Compensation expense					1,000,000	1,000,000
Stock Option
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cash received from stock option exercises					6,000,000	1,000,000
Restricted Stock, Restricted Stock Units, Long Term Performance Units, SARs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation costs		33,000,000			$ 33,000,000		$ 33,000,000
Unrecognized compensation costs, not yet recognized					2 years 2 months 12 days
Share-based Compensation					$ 6,000,000	7,000,000
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized compensation costs		$ 24,000,000			$ 24,000,000		$ 24,000,000
Unrecognized compensation costs, not yet recognized					1 year 8 months 12 days
Total fair value of restricted shares vested					$ 13,000,000	$ 7,000,000
Common Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Amount authorized to repurchase			$ 400,000,000	$ 350,000,000					$ 200,000,000
Period of time to repurchase common stock			3 years	3 years
Previous authorized amount to repurchase			$ 112,000,000
Number of shares repurchased					240,000		8,700,000.0
Value of shares reprchased					$ 16,000,000		$ 454,000,000