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Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income	$ 175	$ 196	$ 198	$ 197	$ 202	$ 107	$ 569	$ 506
Denominator:
Shares outstanding at the beginning of the period (in shares)		62.2			61.3				62.1	59.3
Weighted-average number of shares issued:
Exchange of 1.625% Notes (in shares)	0.0			0.0			0.0	1.3
Stock-based compensation (in shares)	0.0			0.0			0.1	0.2
Denominator for net income per share, basic (in shares)	62.2			61.3			62.2	60.8
Effect of dilutive securities:
1.125% Warrants (in shares)	0.8			5.6			1.8	5.0
1.625% Notes (in shares)	0.0			0.6			0.0	0.5
Stock-based compensation (in shares)	0.6			0.4			0.6	0.3
Denominator for net income per share, diluted (in shares)	63.6			67.9			64.6	66.6
Net income per share:
Basic (in dollars per share)	$ 2.81			$ 3.22			$ 9.15	$ 8.32
Diluted (in dollars per share)	$ 2.75			$ 2.90			$ 8.80	$ 7.60
Stated percentage of warrants				1.625%				1.625%
1.125% Warrants
Net income per share:
Stated percentage of warrants	1.125%	1.125%	1.125%	1.125%	1.125%		1.125%	1.125%
1.625% Notes
Net income per share:
Stated percentage of warrants				1.625%				1.625%

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