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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) 474           474 474  
Other comprehensive income (loss), net of tax (35)         (35)   (35)  
Total comprehensive income 439             439  
Cash dividends:                  
Common stock (124)           (124) (124)  
Dividend equivalent units related to employee stock-based compensation plans (2)           (2) (2)  
Issuance of common shares $ 26       26     26  
Issuance of common shares, Shares 4,218,408 4,218,408   4,218,408          
Tax benefit related to employee stock-based compensation plans $ 12       12     12  
Stock-based compensation expense 23       23     23  
Common stock repurchased (600)   $ (600)         (600)  
Common stock repurchased, Shares     (29,844,520) (29,844,520)          
Shares repurchased related to employee stock-based compensation plans $ (43)   $ (43)         (43)  
Shares repurchased related to employee stock-based compensation plans, Shares (2,075,932)   (2,075,932) (2,075,932)          
Noncontrolling interests in businesses $ 4               $ 4
Ending Balance, Value at Jun. 30, 2015 3,933 $ 4 $ (1,075)   2,954 (26) 2,072 3,929 4
Ending Balance, Shares at Jun. 30, 2015   429,856,043 (55,823,281) 374,032,762          
Beginning Balance, Value at Mar. 31, 2015 4,091 $ 4 $ (767)   2,935 (36) 1,951 4,087 4
Beginning Balance, Shares at Mar. 31, 2015   429,222,873 (40,201,428) 389,021,445          
Comprehensive income:                  
Net income (loss) 182           182 182  
Other comprehensive income (loss), net of tax 10         10   10  
Total comprehensive income 192             192  
Cash dividends:                  
Common stock (61)           (61) (61)  
Issuance of common shares $ 5       5     5  
Issuance of common shares, Shares 633,170 633,170   633,170          
Tax benefit related to employee stock-based compensation plans $ 3       3     3  
Stock-based compensation expense 11       11     11  
Common stock repurchased (300)   $ (300)         (300)  
Common stock repurchased, Shares     (15,190,685) (15,190,685)          
Shares repurchased related to employee stock-based compensation plans $ (8)   $ (8)         (8)  
Shares repurchased related to employee stock-based compensation plans, Shares (431,168)   (431,168) (431,168)          
Ending Balance, Value at Jun. 30, 2015 $ 3,933 $ 4 $ (1,075)   2,954 (26) 2,072 3,929 4
Ending Balance, Shares at Jun. 30, 2015   429,856,043 (55,823,281) 374,032,762          
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) 305           305 305  
Other comprehensive income (loss), net of tax (120)         (120)   (120)  
Total comprehensive income 185             185  
Cash dividends:                  
Common stock (105)           (105) (105)  
Dividend equivalent units related to employee stock-based compensation plans (3)           (3) (3)  
Issuance of common shares $ 8       8     8  
Issuance of common shares, Shares 2,966,592 2,966,592   2,966,592          
Tax benefit related to employee stock-based compensation plans $ (8)       (8)     (8)  
Stock-based compensation expense 18       18     18  
Common stock repurchased (375)   $ (375)         (375)  
Common stock repurchased, Shares     (32,789,662) (32,789,662)          
Shares repurchased related to employee stock-based compensation plans $ (16)   $ (16)         (16)  
Shares repurchased related to employee stock-based compensation plans, Shares (1,354,712)   (1,354,712) (1,354,712)          
Ending Balance, Value at Jun. 30, 2016 $ 3,703 $ 4 $ (1,816)   2,985 (171) 2,677 3,679 24
Ending Balance, Shares at Jun. 30, 2016   433,528,248 (116,495,242) 317,033,006          
Beginning Balance, Value at Mar. 31, 2016 3,839 $ 4 $ (1,636)   2,975 (132) 2,604 3,815 24
Beginning Balance, Shares at Mar. 31, 2016   433,061,241 (102,547,422) 330,513,819          
Comprehensive income:                  
Net income (loss) 125           125 125  
Other comprehensive income (loss), net of tax (39)         (39)   (39)  
Total comprehensive income 86             86  
Cash dividends:                  
Common stock (51)           (51) (51)  
Dividend equivalent units related to employee stock-based compensation plans (1)           (1) (1)  
Issuance of common shares $ 4       4     4  
Issuance of common shares, Shares 467,007 467,007   467,007          
Tax benefit related to employee stock-based compensation plans $ 1       1     1  
Stock-based compensation expense 5       5     5  
Common stock repurchased (175)   $ (175)         (175)  
Common stock repurchased, Shares     (13,579,381) (13,579,381)          
Shares repurchased related to employee stock-based compensation plans $ (5)   $ (5)         (5)  
Shares repurchased related to employee stock-based compensation plans, Shares (368,439)   (368,439) (368,439)          
Ending Balance, Value at Jun. 30, 2016 $ 3,703 $ 4 $ (1,816)   $ 2,985 $ (171) $ 2,677 $ 3,679 $ 24
Ending Balance, Shares at Jun. 30, 2016   433,528,248 (116,495,242) 317,033,006