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Shareholders' Equity (Shareholders' Equity Activities) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Shareholders Equity [Line Items]                      
Beginning Balance       $ 935       $ 2,439 $ 935 $ 2,439 $ 2,511
Acquisition of noncontrolling interest                 (40) 0 0
Share-based compensation                 18 22 16
Common stock issued upon exercise of stock options                 1 4 6
Dividends declared to shareholders                 (47) (47) (36)
Adjustment pursuant to tax sharing agreement                 0 0 (7)
Repurchases of common stock                 (62) (106) (7)
Issuance of ESPP shares                 5 4 4
Investments by noncontrolling interests                   10 9
Distributions to noncontrolling interests                 (28) (61) (109)
Other noncontrolling interest activity                 (3) 2 2
Net income (loss) $ 48 $ 59 $ 68 51 $ (1,231) $ 45 $ 8 (20) 226 (1,198) 171
Other comprehensive income (loss), net of tax                 47 (134) (121)
Ending Balance 1,052       935       1,052 935 2,439
PIC [Member]                      
Shareholders Equity [Line Items]                      
Beginning Balance       2,091       2,065 2,091 2,065 2,049
Acquisition of noncontrolling interest                 (40)    
Share-based compensation                 18 22 16
Common stock issued upon exercise of stock options                 1 4 6
Dividends declared to shareholders                 0 0 0
Adjustment pursuant to tax sharing agreement                     (7)
Repurchases of common stock                 0 0 0
Issuance of ESPP shares                 0 0 1
Investments by noncontrolling interests                   0 0
Distributions to noncontrolling interests                 0 0 0
Other noncontrolling interest activity                 0 0 0
Net income (loss)                 0 0 0
Other comprehensive income (loss), net of tax                 0 0 0
Ending Balance 2,070       2,091       2,070 2,091 2,065
Retained Earnings [Member]                      
Shareholders Equity [Line Items]                      
Beginning Balance       439       1,748 439 1,748 1,709
Acquisition of noncontrolling interest                 0    
Share-based compensation                 0 0 0
Common stock issued upon exercise of stock options                 0 0 0
Dividends declared to shareholders                 47 (47) (36)
Adjustment pursuant to tax sharing agreement                     0
Repurchases of common stock                 0 0 0
Issuance of ESPP shares                 0 0 0
Investments by noncontrolling interests                   0 0
Distributions to noncontrolling interests                 $ 0 0 0
Other noncontrolling interest activity                 0 0
Net income (loss)                 $ 203 (1,262) 75
Other comprehensive income (loss), net of tax                 0 0 0
Ending Balance 595       439       595 439 1,748
Treasury Stock [Member]                      
Shareholders Equity [Line Items]                      
Beginning Balance       (712)       (610) (712) (610) (606)
Acquisition of noncontrolling interest                 0    
Share-based compensation                 0 0 0
Common stock issued upon exercise of stock options                 0 0 0
Dividends declared to shareholders                 0 0 0
Adjustment pursuant to tax sharing agreement                     0
Repurchases of common stock                 62 (106) (7)
Issuance of ESPP shares                 5 4 3
Investments by noncontrolling interests                   0 0
Distributions to noncontrolling interests                 0 0 0
Other noncontrolling interest activity                 0 0 0
Net income (loss)                 0 0 0
Other comprehensive income (loss), net of tax                 0 0 0
Ending Balance (769)       (712)       (769) (712) (610)
AOCL [Member]                      
Shareholders Equity [Line Items]                      
Beginning Balance       (876)       (740) (876) (740) (610)
Acquisition of noncontrolling interest                 0    
Share-based compensation                 0 0 0
Common stock issued upon exercise of stock options                 0 0 0
Dividends declared to shareholders                 0 0 0
Adjustment pursuant to tax sharing agreement                     0
Repurchases of common stock                 0 0 0
Issuance of ESPP shares                 0 0 0
Investments by noncontrolling interests                   0 0
Distributions to noncontrolling interests                 0 0 0
Other noncontrolling interest activity                 0 0 0
Net income (loss)                 0 0 0
Other comprehensive income (loss), net of tax                 45 (136) (130)
Ending Balance (831)       (876)       (831) (876) (740)
Noncontrolling Interests [Member]                      
Shareholders Equity [Line Items]                      
Beginning Balance       $ (7)       $ (24) (7) (24) (31)
Acquisition of noncontrolling interest                 0    
Share-based compensation                 0 0 0
Common stock issued upon exercise of stock options                 0 0 0
Dividends declared to shareholders                 0 0 0
Adjustment pursuant to tax sharing agreement                     0
Repurchases of common stock                 0 0 0
Issuance of ESPP shares                 0 0 0
Investments by noncontrolling interests                   10 9
Distributions to noncontrolling interests                 28 (61) (109)
Other noncontrolling interest activity                 (3) 2 2
Net income (loss)                 23 64 96
Other comprehensive income (loss), net of tax                 2 2 9
Ending Balance $ (13)       $ (7)       $ (13) $ (7) $ (24)