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Investment Securities (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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| Investment Securities [Abstract] | ||||||||||||
| Available-for-sale, amortized cost | $ 612,000,000 | [1] | $ 612,000,000 | [1] | $ 656,000,000 | |||||||
| Available-for-sale, fair value | 612,000,000 | [1] | 612,000,000 | [1] | 656,000,000 | |||||||
| Other Debt Securities Carried at Fair Value | 8,748,000,000 | [2] | 8,748,000,000 | [2] | 7,722,000,000 | [2] | ||||||
| Equity investments | 1,789,000,000 | 1,789,000,000 | 2,627,000,000 | |||||||||
| Other investments | 2,928,000,000 | 2,928,000,000 | 2,620,000,000 | |||||||||
| Total | 14,077,000,000 | 14,077,000,000 | 13,625,000,000 | |||||||||
| Other than Temporary Impairment Losses, Investments [Abstract] | ||||||||||||
| OTTI losses related to non-agency mortgage-backed AFS securities | 0 | 4,000,000 | 0 | 6,000,000 | ||||||||
| OTTI losses for AFS debt securities that Merrill Lynch does not intend to hold to recovery | 0 | 4,000,000 | 0 | 6,000,000 | ||||||||
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Corporate Asset Backed and Non-agency Mortgage Backed Securities [Member]
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| Investment Securities [Abstract] | ||||||||||||
| Available-for-sale, amortized cost | 210,000,000 | 210,000,000 | 266,000,000 | |||||||||
| Available-for-sale, fair value | 210,000,000 | 210,000,000 | 266,000,000 | |||||||||
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Corporate ABS
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| Investment Securities [Abstract] | ||||||||||||
| Available-for-sale, amortized cost | 209,000,000 | 209,000,000 | 226,000,000 | |||||||||
| Available-for-sale, fair value | 209,000,000 | 209,000,000 | 226,000,000 | |||||||||
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Non-agency mortgage backed securities
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| Investment Securities [Abstract] | ||||||||||||
| Available-for-sale, amortized cost | 1,000,000 | 1,000,000 | 40,000,000 | |||||||||
| Available-for-sale, fair value | 1,000,000 | 1,000,000 | 40,000,000 | |||||||||
| Other than Temporary Impairment Losses, Investments [Abstract] | ||||||||||||
| OTTI losses related to non-agency mortgage-backed AFS securities | 0 | 4,000,000 | 0 | 6,000,000 | ||||||||
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U.S. Government and agencies
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| Investment Securities [Abstract] | ||||||||||||
| Available-for-sale, amortized cost | 402,000,000 | 402,000,000 | 390,000,000 | |||||||||
| Available-for-sale, fair value | $ 402,000,000 | $ 402,000,000 | $ 390,000,000 | |||||||||
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