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Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Share Repurchase Program The Company has a share repurchase program under which it may repurchase shares of its common stock in the open market or through privately negotiated other transactions, depending on share price, market conditions and other factors. The share repurchase program does not obligate the Company to repurchase any dollar amount or number of shares, and repurchases may be commenced or suspended from time to time without prior notice. During 2018, the Company repurchased 6.3 million shares of its common stock for $522 million. These repurchases occurred under the program announced on August 3, 2017, by which the Board of Directors authorized a $750 million increase to the Company's share repurchase program. As of December 31, 2018, the Company has $336 million remaining under this program.