| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
The following table summarizes basic and diluted earnings per share (in millions, except for per share amounts): | | | | | | | | | | | | | | | | | | Three Months Ended | | Nine Months Ended | | September 30, 2015 | | September 30, 2014 | | September 30, 2015 | | September 30, 2014 | Basic earnings per share | | | | | | | | Net income attributable to stockholders | $ | 1,359 |
| | $ | 1,471 |
| | $ | 3,421 |
| | $ | 1,962 |
| Less: cumulative dividends on Series A preferred stock(a) |
| | (87 | ) | |
| | (263 | ) | Net income attributable to common stockholders | $ | 1,359 |
| | $ | 1,384 |
| | $ | 3,421 |
| | $ | 1,699 |
| | | | | | | | | Weighted-average common shares outstanding | 1,577 |
| | 1,612 |
| | 1,597 |
| | 1,603 |
| Basic earnings per common share | $ | 0.86 |
| | $ | 0.86 |
| | $ | 2.14 |
| | $ | 1.06 |
| Diluted earnings per share | | | | | | | | Net income attributable to common stockholders – basic | $ | 1,359 |
| | $ | 1,384 |
| | $ | 3,421 |
| | $ | 1,699 |
| Less: earnings adjustment for dilutive stock compensation rights | (2 | ) | | (8 | ) | | (3 | ) | | (22 | ) | Net income attributable to common stockholders – diluted | $ | 1,357 |
| | $ | 1,376 |
| | $ | 3,418 |
| | $ | 1,677 |
| | | | | | | | | Weighted-average common shares outstanding – basic | 1,577 |
| | 1,612 |
| | 1,597 |
| | 1,603 |
| Dilutive effect of warrants and restricted stock units (RSUs) | 41 |
| | 79 |
| | 58 |
| | 87 |
| Weighted-average common shares outstanding – diluted | 1,618 |
| | 1,691 |
| | 1,655 |
| | 1,690 |
| | | | | | | | | Diluted earnings per common share | $ | 0.84 |
| | $ | 0.81 |
| | $ | 2.07 |
| | $ | 0.99 |
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________ | | (a) | Includes earned but undeclared dividends of $15 million on our Series A preferred stock in the three and nine months ended September 30, 2014. |
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