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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income (numerator):                      
Income (Loss) from Continuing Operations Attributable to Parent                 $ (1,230) $ (3,362) $ 650
Income (loss) from discontinued operations, net of tax                 0 0 250
Net income (loss) $ 13 $ 48 $ (667) $ (624) $ (663) $ (1,227) $ (992) $ (480) $ (1,230) $ (3,362) $ 900
Weighted average shares (denominator):                      
Weighted average shares - basic                 193 159 137
Dilution effect of stock options and unvested restricted stock and restricted stock units outstanding at end of period                 0 0 1
Weighted average shares - diluted                 193 159 138
Basic --                      
Income (loss) from continuing operations                 $ (6.36) $ (21.18) $ 4.76
Income (loss) from discontinued operations                 0.00 0.00 1.83
Earnings (Loss) Per Share, Basic $ 0.07 $ 0.24 $ (3.36) $ (3.52) $ (4.06) $ (7.52) $ (6.09) $ (3.30) (6.36) (21.18) 6.59
Diluted --                      
Income (loss) from continuing operations                 (6.36) (21.18) 4.71
Income (loss) from discontinued operations                 0.00 0.00 1.81
Earnings (Loss) Per Share, Diluted $ 0.07 $ 0.24 $ (3.36) $ (3.52) $ (4.06) $ (7.52) $ (6.09) $ (3.30) $ (6.36) $ (21.18) $ 6.52
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]                
The following is the calculation of basic and diluted weighted-average shares outstanding and EPS for the indicated years: 
 
 
2016
 
2015
 
2014
 
 
(In millions, except per share data)
Income (numerator):
 
 
 
 
 
 
Income (loss) from continuing operations
 
$
(1,230
)
 
$
(3,362
)
 
$
650

Income (loss) from discontinued operations
 
—

 
—

 
250

Net income (loss)
 
$
(1,230
)
 
$
(3,362
)
 
$
900

 
 
 
 
 
 
 
Weighted-average shares (denominator):
 
 
 
 
 
 
Weighted-average shares — basic
 
193

 
159

 
137

Dilution effect of stock options and unvested restricted stock and restricted stock units outstanding at end of period
 
—

 
—

 
1

Weighted-average shares — diluted
 
193

 
159

 
138

Excluded due to anti-dilutive effect
 
2

 
3

 
1

 
 
 
 
 
 
 
Earnings (loss) per share:
 
 
 
 
 
 
Basic:
 
 
 
 
 
 
Income (loss) from continuing operations
 
$
(6.36
)
 
$
(21.18
)
 
$
4.76

Income (loss) from discontinued operations
 
—

 
—

 
1.83

Basic earnings (loss) per share
 
$
(6.36
)
 
$
(21.18
)
 
$
6.59

Diluted:
 
 
 
 
 
 
Income (loss) from continuing operations
 
$
(6.36
)
 
$
(21.18
)
 
$
4.71

Income (loss) from discontinued operations
 
—

 
—

 
1.81

Diluted earnings (loss) per share
 
$
(6.36
)
 
$
(21.18
)
 
$
6.52

    
Earnings Per Share (Textuals) [Abstract]                      
Incremental shares attributable to the assumed exercise of outstanding stock options and the assumed vesting of unvested restricted stock and restricted stock units                 2 3 1