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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
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  |  |  | $ 1,485 | $ (262) | $ 613
Preferred Stock Dividends, Income Statement Impact |  |  |  |  |  |  |  |  | 6 | 0 | 0
Income loss from Continuing Operations Net of Tax Available to Common Shareholders |  |  |  |  |  |  |  |  | 1,479 | (262) | 613
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 322 | (2,869) | 283
Net income (loss) available to common stockholders | $ 190 | $ 432 | $ 582 | $ 597 | $ (3,703) | $ 234 | $ (40) | $ 378 | $ 1,801 | $ (3,131) | $ 896
Shares |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding, basic | 359.1 | 358.6 | 358.3 | 357.5 | 357.0 | 360.2 | 366.0 | 371.4 | 358.4 | 363.7 | 387.7
Dilutive effect of warrants |  |  |  |  |  |  |  |  | 1.9 | 0.0 | 3.6
Dilutive effect of stock-based awards under compensation plans |  |  |  |  |  |  |  |  | 3.8 | 0.0 | 3.5
Weighted average common shares outstanding and dilutive potential common shares [1] | 364.0 | 364.1 | 364.2 | 363.9 | 357.0 | 367.0 | 366.0 | 378.6 | 364.1 | 363.7 | 394.8
Basic |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax, available to common stockholders | $ 0.53 | $ 1.19 | $ 1.21 | $ 1.20 | $ (1.56) | $ 0.40 | $ (0.42) | $ 0.82 | $ 4.13 | $ (0.72) | $ 1.58
Income (loss) from discontinued operations, net of tax, available to common stockholders | 0 | 0.01 | 0.41 | 0.47 | (8.81) | 0.25 | 0.31 | 0.20 | 0.90 | (7.89) | 0.73
Net income (loss) available to common stockholders | 0.53 | 1.20 | 1.62 | 1.67 | (10.37) | 0.65 | (0.11) | 1.02 | 5.03 | (8.61) | 2.31
Diluted |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax, available to common stockholders | 0.52 | 1.17 | 1.19 | 1.18 | (1.56) | 0.40 | (0.42) | 0.80 | 4.06 | (0.72) | 1.55
Income (loss) from discontinued operations, net of tax, available to common stockholders | 0 | 0.02 | 0.41 | 0.46 | (8.81) | 0.24 | 0.31 | 0.20 | 0.89 | (7.89) | 0.72
Net income (loss) available to common stockholders | $ 0.52 | $ 1.19 | $ 1.60 | $ 1.64 | $ (10.37) | $ 0.64 | $ (0.11) | $ 1.00 | $ 4.95 | $ (8.61) | $ 2.27
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 |

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