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Shareholders' Equity (Shareholders' Equity Activities) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Shareholders Equity [Line Items]        
Beginning Balance     $ 935 $ 2,439
Acquisition of noncontrolling interest     (40)  
Stock-based compensation     10 11
Common stock issued upon exercise of stock options     1 4
Tax benefit increase related to share based plans       1
Dividends declared to shareholders     (23) (24)
Repurchases of common stock     (17) (96)
Issuance of ESPP shares     2 2
Investments by noncontrolling interests     0 8
Distributions to noncontrolling interests     (12) (33)
Net income (loss) $ 68 $ 8 119 (12)
Other comprehensive income (loss), net of tax 7 22 (39) 39
Ending Balance 936 2,339 936 2,339
Cumulative translation adjustments (5) 5 (5) 5
Pension liability adjustments (228) (216) (228) (216)
Unrealized gains (losses) on derivatives 0 0 0 0
Additional Paid-in Capital [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     2,091 2,065
Acquisition of noncontrolling interest     (40)  
Stock-based compensation     10 11
Common stock issued upon exercise of stock options     1 4
Tax benefit increase related to share based plans       1
Dividends declared to shareholders     0 0
Repurchases of common stock     0 0
Issuance of ESPP shares     (1) 0
Investments by noncontrolling interests     0 0
Distributions to noncontrolling interests     0 0
Net income (loss)     0 0
Other comprehensive income (loss), net of tax     0 0
Ending Balance 2,061 2,081 2,061 2,081
Retained Earnings [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     439 1,748
Acquisition of noncontrolling interest     0  
Stock-based compensation     0 0
Common stock issued upon exercise of stock options     0 0
Tax benefit increase related to share based plans       0
Dividends declared to shareholders     (23) (24)
Repurchases of common stock     0 0
Issuance of ESPP shares     0 0
Investments by noncontrolling interests     0 0
Distributions to noncontrolling interests     0 0
Net income (loss)     106 (51)
Other comprehensive income (loss), net of tax     0 0
Ending Balance 522 1,673 522 1,673
Treasury Stock [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     (712) (610)
Acquisition of noncontrolling interest     0  
Stock-based compensation     0 0
Common stock issued upon exercise of stock options     0 0
Tax benefit increase related to share based plans       0
Dividends declared to shareholders     0 0
Repurchases of common stock     (17) (96)
Issuance of ESPP shares     3 2
Investments by noncontrolling interests     0 0
Distributions to noncontrolling interests     0 0
Net income (loss)     0 0
Other comprehensive income (loss), net of tax     0 0
Ending Balance (726) (704) (726) (704)
Accumulated Other Comprehensive Income (Loss) [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     (876) (740)
Acquisition of noncontrolling interest     0  
Stock-based compensation     0 0
Common stock issued upon exercise of stock options     0 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
Investments by noncontrolling interests     0 0
Distributions to noncontrolling interests     0 0
Net income (loss)     0 0
Other comprehensive income (loss), net of tax     (40) 39
Ending Balance (916) (701) (916) (701)
Noncontrolling Interests [Member]        
Shareholders Equity [Line Items]        
Beginning Balance     (7) (24)
Acquisition of noncontrolling interest     0  
Stock-based compensation     0 0
Common stock issued upon exercise of stock options     0 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
Investments by noncontrolling interests     0 8
Distributions to noncontrolling interests     (12) (33)
Net income (loss)     13 39
Other comprehensive income (loss), net of tax     1 0
Ending Balance $ (5) $ (10) $ (5) $ (10)