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Earnings Per Common Share (EPS) (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
Basic and diluted: |  |  |  |  |  |  |  |  |  |  |  |
Net Income from continuing operations |  |  |  |  |  |  |  |  |  | $ 2,736 | $ 5,408 | $ 5,163
Dividends Preferred Stock |  | $ (20) | $ (21) | $ (19) | $ (21) | $ (19) | $ (21) | $ (19) | $ (21) | (81) | (80) | (62)
Earnings allocated to participating share awards |  | $ (2) | $ (11) | $ (11) | $ (10) | $ (6) | $ (9) | $ (17) | $ (11) | $ (21) | $ (43) | $ (38)
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic: Weighted-average common stock |  |  |  |  |  |  |  |  |  | 883.0 | 933.0 | 999.0
Add: Weighted-average stock options |  |  |  |  |  |  |  |  |  | 3.0 | 2.0 | 4.0
Diluted |  |  |  |  |  |  |  |  |  | 886.0 | 935.0 | 1,003.0
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Basic | [1] |  |  |  |  |  |  |  |  | $ 2.98 | $ 5.67 | $ 5.07
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  | $ 2.97 | $ 5.65 | $ 5.05
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per Share, amount |  |  |  |  |  |  |  |  |  | 0.6 | 2.4 | 0.5
[1] | Represents net income less (i) earnings allocated to participating share awards of $ 21 million, $ 43 million and $ 38 million for the years ended December 31, 2017 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 81 million, $ 80 million and $ 62 million for the years ended December 31, 2017 , 2016 and 2015 , respectively.

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