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Shareholders' Equity (Shareholders' Equity Activities) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Shareholders Equity [Line Items]        
Beginning Balance     $ 1,052 $ 935
Acquisition of noncontrolling interest       (40)
Share-based compensation     14 14
Common stock issued upon exercise of stock options       1
Tax benefit increase related to share-based plans     0  
Dividends declared to shareholders     (34) (35)
Repurchases of common stock     (2) (22)
Issuance of ESPP shares     3 5
Distributions to noncontrolling interests     (9) (21)
Net income (loss) $ (57) $ 59 35 178
Other comprehensive income (loss), net of tax 15 (2) 38 (41)
Ending Balance 1,097 974 1,097 974
Additional Paid-in Capital [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     2,070 2,091
Acquisition of noncontrolling interest       (40)
Share-based compensation     14 14
Common stock issued upon exercise of stock options       1
Tax benefit increase related to share-based plans     0  
Dividends declared to shareholders     0 0
Repurchases of common stock     0 0
Issuance of ESPP shares     (1) 0
Distributions to noncontrolling interests     0 0
Net income (loss)     0 0
Other comprehensive income (loss), net of tax     0 0
Ending Balance 2,083 2,066 2,083 2,066
Retained Earnings [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     595 439
Acquisition of noncontrolling interest       0
Share-based compensation     0 0
Common stock issued upon exercise of stock options       0
Tax benefit increase related to share-based plans     0  
Dividends declared to shareholders     (34) (35)
Repurchases of common stock     0 0
Issuance of ESPP shares     0 0
Distributions to noncontrolling interests     0 0
Net income (loss)     26 161
Other comprehensive income (loss), net of tax     0 0
Ending Balance 587 565 587 565
Treasury Stock [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     (769) (712)
Acquisition of noncontrolling interest       0
Share-based compensation     0 0
Common stock issued upon exercise of stock options       0
Tax benefit increase related to share-based plans     0  
Dividends declared to shareholders     0 0
Repurchases of common stock     (2) (22)
Issuance of ESPP shares     4 5
Distributions to noncontrolling interests     0 0
Net income (loss)     0 0
Other comprehensive income (loss), net of tax     0 0
Ending Balance (767) (729) (767) (729)
Accumulated Other Comprehensive Income (Loss) [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     (831) (876)
Acquisition of noncontrolling interest       0
Share-based compensation     0 0
Common stock issued upon exercise of stock options       0
Tax benefit increase related to share-based plans     0  
Dividends declared to shareholders     0 0
Repurchases of common stock     0 0
Issuance of ESPP shares     0 0
Distributions to noncontrolling interests     0 0
Net income (loss)     0 0
Other comprehensive income (loss), net of tax     39 (44)
Ending Balance (792) (920) (792) (920)
Noncontrolling Interests [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     (13) (7)
Acquisition of noncontrolling interest       0
Share-based compensation     0 0
Common stock issued upon exercise of stock options       0
Tax benefit increase related to share-based plans     0  
Dividends declared to shareholders     0 0
Repurchases of common stock     0 0
Issuance of ESPP shares     0 0
Distributions to noncontrolling interests     (9) (21)
Net income (loss)     9 17
Other comprehensive income (loss), net of tax     (1) 3
Ending Balance $ (14) $ (8) $ (14) $ (8)