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Condensed Consolidated Statements of Financial Condition (Parenthetical) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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| Statement of Financial Position [Abstract] | ||||||
| Amount of total investment securities at fair value (in dollars) | $ 2,663,000,000 | [1] | $ 3,847,000,000 | [1] | ||
| Amount of total loan receivables at fair value (in dollars) | 180,000,000 | 122,000,000 | ||||
| Common stock, par value per share (in dollars per share) | $ 0.01 | $ 0.01 | ||||
| Common stock, shares authorized | 2,000,000,000 | 2,000,000,000 | ||||
| Common stock, shares issued | 560,542,486 | 558,194,324 | ||||
| Preferred stock, par or stated value per share (in dollars per share) | $ 0.01 | $ 0.01 | ||||
| Preferred stock, shares authorized | 200,000,000 | 200,000,000 | ||||
| Preferred stock, shares issued | 575,000 | 575,000 | ||||
| Preferred stock, shares outstanding | 575,000 | 575,000 | ||||
| Preferred stock, liquidation preference (in dollars) | $ 575,000,000 | $ 575,000,000 | ||||
| Treasury stock, shares | 115,973,061 | 109,006,038 | ||||
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