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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On February 1, 2018, we announced that our Board of Directors approved a $250 million increase to our stock repurchase program, bringing the total authorization to $500 million. Under the program, we may repurchase shares from time to time in open market transactions or in privately-negotiated transactions in accordance with applicable securities laws. We may discontinue the program at any time. The timing and the amount of any repurchases will be determined based on market conditions and other factors. We expect that stock repurchases will be funded with available cash on hand. During 2017, we repurchased $184 million of our common stock, leaving $316 million of authorization remaining.