Common Stock	6 Months Ended
Jun. 30, 2017
Equity [Abstract]
Common Stock	Common Stock During the first six months of 2017, the Company repurchased approximately 5.4 million shares of its common stock for consideration of $400 million. During the first six months of 2016, the Company repurchased approximately 7.0 million shares of its common stock for consideration of $425 million. In November 2016, the Board of Directors of the Company authorized the Company to repurchase up to $2.5 billion in shares of the Company's common stock, which superseded any prior authorizations. As of June 30, 2017, the Company remained authorized to repurchase up to approximately $2 billion in shares of its common stock. There is no time limit on the authorization. The Company issued approximately 3.7 million and 4.1 million shares related to stock compensation and employee stock purchase plans during the first six months of 2017 and 2016, respectively.

Common Stock

6 Months Ended

Jun. 30, 2017

During the first six months of 2017, the Company repurchased approximately 5.4 million shares of its common stock for consideration of $400 million. During the first six months of 2016, the Company repurchased approximately 7.0 million shares of its common stock for consideration of $425 million. In November 2016, the Board of Directors of the Company authorized the Company to repurchase up to $2.5 billion in shares of the Company's common stock, which superseded any prior authorizations. As of June 30, 2017, the Company remained authorized to repurchase up to approximately $2 billion in shares of its common stock. There is no time limit on the authorization.

The Company issued approximately 3.7 million and 4.1 million shares related to stock compensation and employee stock purchase plans during the first six months of 2017 and 2016, respectively.