Capital Transactions	12 Months Ended
Dec. 31, 2015
Equity [Abstract]
Capital Transactions	Capital Transactions Stock Purchase Agreement On October 11, 2013, as described in Note 1 of the Notes to Consolidated Financial Statements, we completed the Purchase Transaction, repurchasing approximately 429 million shares of our common stock for a cash payment of $5.83 billion, pursuant to the terms of the Stock Purchase Agreement (refer to Note 11 of the Notes to Consolidated Financial Statements for financing details of the Purchase Transaction). The repurchased shares were recorded in "Treasury Stock" in our consolidated balance sheet. Repurchase Programs On February 3, 2015, our Board of Directors authorized a stock repurchase program under which we may repurchase up to $750 million of our common stock during the two-year period from February 9, 2015 through February 8, 2017. During the year ended December 31, 2015, there were no repurchases pursuant to this stock repurchase program. Dividend On February 2, 2016, our Board of Directors declared a cash dividend of $0.26 per common share, payable on May 11, 2016, to shareholders of record at the close of business on March 30, 2016. On February 3, 2015, our Board of Directors declared a cash dividend of $0.23 per common share, payable on May 13, 2015, to shareholders of record at the close of business on March 30, 2015. On May 13, 2015, we made an aggregate cash dividend payment of $167 million to such shareholders, and on May 29, 2015, we made related dividend equivalent payments of $3 million to certain holders of restricted stock rights. On February 6, 2014, our Board of Directors declared a cash dividend of $0.20 per common share, payable on May 14, 2014, to shareholders of record at the close of business on March 19, 2014. On May 14, 2014, we made an aggregate cash dividend payment of $143 million to such shareholders, and on May 30, 2014, we made related dividend equivalent payments of $4 million to the holders of restricted stock rights. On February 7, 2013, our Board of Directors declared a cash dividend of $0.19 per common share, payable on May 15, 2013, to shareholders of record at the close of business on March 20, 2013. On May 15, 2013, we made an aggregate cash dividend payment of $212 million to such shareholders, and on May 31, 2013, we made related dividend equivalent payments of $4 million to the holders of restricted stock rights.

Capital Transactions

Stock Purchase Agreement

On October 11, 2013, as described in Note 1 of the Notes to Consolidated Financial Statements, we completed the Purchase Transaction, repurchasing approximately 429 million shares of our common stock for a cash payment of $5.83 billion, pursuant to the terms of the Stock Purchase Agreement (refer to Note 11 of the Notes to Consolidated Financial Statements for financing details of the Purchase Transaction). The repurchased shares were recorded in "Treasury Stock" in our consolidated balance sheet.

Repurchase Programs

On February 3, 2015, our Board of Directors authorized a stock repurchase program under which we may repurchase up to $750 million of our common stock during the two-year period from February 9, 2015 through February 8, 2017. During the year ended December 31, 2015, there were no repurchases pursuant to this stock repurchase program.

Dividend

On February 2, 2016, our Board of Directors declared a cash dividend of $0.26 per common share, payable on May 11, 2016, to shareholders of record at the close of business on March 30, 2016.

On February 3, 2015, our Board of Directors declared a cash dividend of $0.23 per common share, payable on May 13, 2015, to shareholders of record at the close of business on March 30, 2015. On May 13, 2015, we made an aggregate cash dividend payment of $167 million to such shareholders, and on May 29, 2015, we made related dividend equivalent payments of $3 million to certain holders of restricted stock rights.

On February 6, 2014, our Board of Directors declared a cash dividend of $0.20 per common share, payable on May 14, 2014, to shareholders of record at the close of business on March 19, 2014. On May 14, 2014, we made an aggregate cash dividend payment of $143 million to such shareholders, and on May 30, 2014, we made related dividend equivalent payments of $4 million to the holders of restricted stock rights.

On February 7, 2013, our Board of Directors declared a cash dividend of $0.19 per common share, payable on May 15, 2013, to shareholders of record at the close of business on March 20, 2013. On May 15, 2013, we made an aggregate cash dividend payment of $212 million to such shareholders, and on May 31, 2013, we made related dividend equivalent payments of $4 million to the holders of restricted stock rights.