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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, 2014 $ 4,198 $ 4 $ (432)   $ 2,893 $ 9 $ 1,724 $ 4,198  
Beginning Balance, Shares at Dec. 31, 2014   425,637,635 (23,902,829) 401,734,806          
Comprehensive income:                  
Net income (loss) 711           711 711  
Other comprehensive income (loss), net of tax (91)         (91)   (91)  
Total comprehensive income 620             620  
Cash dividends:                  
Common stock (182)           (182) (182)  
Dividend equivalent units related to employee stock-based compensation plans (2)           (2) (2)  
Issuance of common shares $ 33       33     33  
Issuance of common shares, Shares 4,781,517 4,781,517   4,781,517          
Tax benefit related to employee stock-based compensation plans $ 11       11     11  
Stock-based compensation expense 27       27     27  
Common stock repurchased (775)   $ (775)         (775)  
Common stock repurchased, Shares     (41,919,908) (41,919,908)          
Shares repurchased related to employee stock-based compensation plans $ (47)   $ (47)         (47)  
Shares repurchased related to employee stock-based compensation plans, Shares (2,287,761)   (2,287,761) (2,287,761)          
Noncontrolling interests in businesses $ 4               $ 4
Ending Balance, Value at Sep. 30, 2015 3,887 $ 4 $ (1,254)   2,964 (82) 2,251 3,883 4
Ending Balance, Shares at Sep. 30, 2015   430,419,152 (68,110,498) 362,308,654          
Beginning Balance, Value at Jun. 30, 2015 3,933 $ 4 $ (1,075)   2,954 (26) 2,072 3,929 4
Beginning Balance, Shares at Jun. 30, 2015   429,856,043 (55,823,281) 374,032,762          
Comprehensive income:                  
Net income (loss) 237           237 237  
Other comprehensive income (loss), net of tax (56)         (56)   (56)  
Total comprehensive income 181             181  
Cash dividends:                  
Common stock (58)           (58) (58)  
Issuance of common shares $ 6       6     6  
Issuance of common shares, Shares 563,109 563,109   563,109          
Stock-based compensation expense $ 4       4     4  
Common stock repurchased (175)   $ (175)         (175)  
Common stock repurchased, Shares     (12,075,388) (12,075,388)          
Shares repurchased related to employee stock-based compensation plans $ (4)   $ (4)         (4)  
Shares repurchased related to employee stock-based compensation plans, Shares (211,829)   (211,829) (211,829)          
Ending Balance, Value at Sep. 30, 2015 $ 3,887 $ 4 $ (1,254)   2,964 (82) 2,251 3,883 4
Ending Balance, Shares at Sep. 30, 2015   430,419,152 (68,110,498) 362,308,654          
Beginning Balance, Value at Dec. 31, 2015 3,999 $ 4 $ (1,425)   2,967 (51) 2,480 3,975 24
Beginning Balance, Shares at Dec. 31, 2015   430,561,656 (82,350,868) 348,210,788          
Comprehensive income:                  
Net income (loss) 535           535 535  
Other comprehensive income (loss), net of tax (75)         (75)   (75)  
Total comprehensive income 460             460  
Cash dividends:                  
Common stock (154)           (154) (154)  
Dividend equivalent units related to employee stock-based compensation plans (3)           (3) (3)  
Issuance of common shares $ 25       25     25  
Issuance of common shares, Shares 4,525,047 4,525,047   4,525,047          
Tax benefit related to employee stock-based compensation plans $ (8)       (8)     (8)  
Stock-based compensation expense 22       22     22  
Common stock repurchased (575)   $ (575)         (575)  
Common stock repurchased, Shares     (47,137,636) (47,137,636)          
Shares repurchased related to employee stock-based compensation plans $ (32)   $ (32)         (32)  
Shares repurchased related to employee stock-based compensation plans, Shares (2,499,729)   (2,499,729) (2,499,729)          
Ending Balance, Value at Sep. 30, 2016 $ 3,734 $ 4 $ (2,032)   3,006 (126) 2,858 3,710 24
Ending Balance, Shares at Sep. 30, 2016   435,086,703 (131,988,233) 303,098,470          
Beginning Balance, Value at Jun. 30, 2016 3,703 $ 4 $ (1,816)   2,985 (171) 2,677 3,679 24
Beginning Balance, Shares at Jun. 30, 2016   433,528,248 (116,495,242) 317,033,006          
Comprehensive income:                  
Net income (loss) 230           230 230  
Other comprehensive income (loss), net of tax 45         45   45  
Total comprehensive income 275             275  
Cash dividends:                  
Common stock (49)           (49) (49)  
Issuance of common shares $ 17       17     17  
Issuance of common shares, Shares 1,558,455 1,558,455   1,558,455          
Stock-based compensation expense $ 4       4     4  
Common stock repurchased (200)   $ (200)         (200)  
Common stock repurchased, Shares     (14,347,974) (14,347,974)          
Shares repurchased related to employee stock-based compensation plans $ (16)   $ (16)         (16)  
Shares repurchased related to employee stock-based compensation plans, Shares (1,145,017)   (1,145,017) (1,145,017)          
Ending Balance, Value at Sep. 30, 2016 $ 3,734 $ 4 $ (2,032)   $ 3,006 $ (126) $ 2,858 $ 3,710 $ 24
Ending Balance, Shares at Sep. 30, 2016   435,086,703 (131,988,233) 303,098,470