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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Stock [Member]
Treasury Stock [Member]
Common Stock Shares Outstanding [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Total Stockholders' Equity [Member]
Noncontrolling Interest [Member]
Beginning Balance, Value at Dec. 31, 2015 $ 3,933 $ 4 $ (1,425)   $ 2,967 $ (51) $ 2,414 $ 3,909 $ 24
Beginning Balance, Shares at Dec. 31, 2015   430,561,656 (82,350,868) 348,210,788          
Comprehensive income:                  
Net income 181           181 181  
Other comprehensive income (loss), net of tax (81)         (81)   (81)  
Total comprehensive income 100             100  
Cash dividends:                  
Common stock (54)           (54) (54)  
Dividend equivalent units related to employee stock-based compensation plans (3)           (3) (3)  
Issuance of common shares $ 4       4     4  
Issuance of common shares, Shares 2,499,585 2,499,585   2,499,585          
Tax impact of employee stock-based compensation plans $ (8)       (8)     (8)  
Stock-based compensation expense 12       12     12  
Common stock repurchased (200)   $ (200)         (200)  
Common stock repurchased, Shares     (19,210,281) (19,210,281)          
Shares repurchased related to employee stock-based compensation plans $ (11)   $ (11)         (11)  
Shares repurchased related to employee stock-based compensation plans, Shares (986,273)   (986,273) (986,273)          
Ending Balance, Value at Mar. 31, 2016 $ 3,773 $ 4 $ (1,636)   2,975 (132) 2,538 3,749 24
Ending Balance, Shares at Mar. 31, 2016   433,061,241 (102,547,422) 330,513,819          
Beginning Balance, Value at Dec. 31, 2016 3,723 $ 4 $ (2,223)   3,022 6 2,890 3,699 24
Beginning Balance, Shares at Dec. 31, 2016   436,037,666 (145,173,548) 290,864,118          
Comprehensive income:                  
Net income 88           88 88  
Other comprehensive income (loss), net of tax 16         16   16  
Total comprehensive income 104             104  
Cash dividends:                  
Common stock (46)           (46) (46)  
Dividend equivalent units related to employee stock-based compensation plans (2)           (2) (2)  
Issuance of common shares $ 11       11     11  
Issuance of common shares, Shares 2,794,510 2,794,510   2,794,510          
Stock-based compensation expense $ 14       14     14  
Common stock repurchased (110)   $ (110)         (110)  
Common stock repurchased, Shares     (7,363,292) (7,363,292)          
Shares repurchased related to employee stock-based compensation plans $ (22)   $ (22)         (22)  
Shares repurchased related to employee stock-based compensation plans, Shares (1,354,280)   (1,354,280) (1,354,280)          
Ending Balance, Value at Mar. 31, 2017 $ 3,672 $ 4 $ (2,355)   $ 3,047 $ 22 $ 2,930 $ 3,648 $ 24
Ending Balance, Shares at Mar. 31, 2017   438,832,176 (153,891,120) 284,941,056