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Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings                      
(Loss) income from continuing operations, net of tax                 $ (262) $ 613 $ 1,189
(Loss) income from discontinued operations, net of tax                 (2,869) 283 493
Net (loss) income $ (3,703) $ 234 $ (40) $ 378 $ (81) $ 438 $ 216 $ 323 $ (3,131) $ 896 $ 1,682
Shares                      
Weighted average common shares outstanding, basic (in shares) 357.0 360.2 366.0 371.4 376.6 383.8 391.8 398.5 363.7 387.7 415.5
Dilutive effect of warrants (in shares)                 0.0 3.6 4.7
Dilutive effect of stock-based awards under compensation plans (in shares)                 0.0 3.5 5.0
Weighted average shares outstanding and dilutive potential common shares (in shares) 357.0 367.0 366.0 378.6 376.6 390.5 398.6 406.3 363.7 394.8 425.2
Basic                      
(Loss) income from continuing operations, net of tax (in USD per share) $ (1.56) $ 0.40 $ (0.42) $ 0.82 $ (0.36) $ 0.91 $ 0.25 $ 0.75 $ (0.72) $ 1.58 $ 2.86
(Loss) income from discontinued operations, net of tax (in USD per share) (8.81) 0.25 0.31 0.20 0.14 0.23 0.30 0.06 (7.89) 0.73 1.19
Basic earnings (losses) per common share (in USD per share) (10.37) 0.65 (0.11) 1.02 (0.22) 1.14 0.55 0.81 (8.61) 2.31 4.05
Diluted                      
(Loss) income from continuing operations, net of tax (in USD per share) (1.56) 0.40 (0.42) 0.80 (0.36) 0.90 0.25 0.73 (0.72) 1.55 2.80
(Loss) income from discontinued operations, net of tax (in USD per share) (8.81) 0.24 0.31 0.20 0.14 0.22 0.29 0.06 (7.89) 0.72 1.16
Diluted earnings (losses) per common share (in USD per share) $ (10.37) $ 0.64 $ (0.11) $ 1.00 $ (0.22) $ 1.12 $ 0.54 $ 0.79 $ (8.61) $ 2.27 $ 3.96
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Number of shares outstanding, including antidilutive shares (in shares) 370.5               370.5    
Stock Compensation Plan                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities (in shares)                 4.3    
Warrant                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities (in shares)                 2.5