Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares 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 |
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| Basic and diluted: | |||||||||||||
| Net Income from continuing operations | $ 5,408,000,000 | $ 5,163,000,000 | $ 5,885,000,000 | ||||||||||
| Dividends Preferred Stock | $ (19,000,000) | $ (21,000,000) | $ (19,000,000) | $ (21,000,000) | $ (20,000,000) | $ (22,000,000) | $ (20,000,000) | $ 0 | (80,000,000) | (62,000,000) | 0 | ||
| Net income available to common shareholders | 5,328,000,000 | 5,101,000,000 | 5,885,000,000 | ||||||||||
| Earnings allocated to participating share awards | $ (6,000,000) | $ (9,000,000) | $ (17,000,000) | $ (11,000,000) | $ (6,000,000) | $ (10,000,000) | $ (11,000,000) | $ (11,000,000) | (43,000,000) | (38,000,000) | (46,000,000) | ||
| Net income attributable to common shareholders | $ 5,285,000,000 | $ 5,063,000,000 | $ 5,839,000,000 | ||||||||||
| Denominator: | |||||||||||||
| Basic: Weighted-average common stock | 933.0 | 999.0 | 1,045.0 | ||||||||||
| Add: Weighted-average stock options | 2.0 | 4.0 | 6.0 | ||||||||||
| Diluted | 935.0 | 1,003.0 | 1,051.0 | ||||||||||
| Basic EPS: | |||||||||||||
| Basic | [1] | $ 5.67 | $ 5.07 | $ 5.58 | |||||||||
| Diluted EPS: | |||||||||||||
| Diluted | $ 5.65 | $ 5.05 | $ 5.56 | ||||||||||
| Stock Option [Member] | |||||||||||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||||||||||||
| Antidilutive securities excluded from computation of earnings per Share, amount | 2.4 | 0.5 | 0.2 | ||||||||||
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