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Stockholders' Equity - Common Stock Rollforward (Detail) - shares
shares in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares of common stock issued        
Shares at January 1   572,000 528,000 526,000
Exercise of stock options   0 [1] 1,000 1,000
Issuance of common stock 40,500 0 41,000 0
Issuance of restricted stock   2,000 2,000 1,000
Shares at December 31   574,200 572,000 528,000
Shares of common stock held in treasury        
Shares at January 1   20,800 20,000 19,000
Purchase of treasury stock   22,000 0 0
Shares received for restricted stock vested and stock options exercised   0 1,000 1,000
Shares at December 31   43,400 20,800 20,000
Shares of common stock outstanding at December 31   531,000 551,000 508,000
[1] The total intrinsic value of stock options exercised was zero during 2017, $7 million during 2016, and $23 million during 2015, based on the difference between the market price at the exercise date and the exercise price.