|
Investment Securities (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2013
|
Mar. 31, 2012
|
Dec. 31, 2012
|
|||||||
| Investment Securities [Abstract] | |||||||||
| Available-for-sale, amortized cost | $ 615 | [1] | $ 656 | ||||||
| Available-for-sale, fair value | 615 | [1] | 656 | ||||||
| Other Debt Securities Carried at Fair Value | 7,512 | [2] | 7,722 | [2] | |||||
| Equity investments | 2,080 | 2,627 | |||||||
| Other investments | 2,880 | 2,620 | |||||||
| Total | 13,087 | 13,625 | |||||||
| Other than Temporary Impairment Losses, Investments [Abstract] | |||||||||
| OTTI losses related to non-agency mortgage-backed AFS securities | 0 | 2 | |||||||
| OTTI losses for AFS debt securities that Merrill Lynch does not intend to hold to recovery | 0 | 2 | |||||||
|
Corporate Asset Backed and Non-agency Mortgage Backed Securities [Member]
|
|||||||||
| Investment Securities [Abstract] | |||||||||
| Available-for-sale, amortized cost | 212 | 266 | |||||||
| Available-for-sale, fair value | 212 | 266 | |||||||
|
Corporate ABS
|
|||||||||
| Investment Securities [Abstract] | |||||||||
| Available-for-sale, amortized cost | 175 | 226 | |||||||
| Available-for-sale, fair value | 175 | 226 | |||||||
|
Non-agency mortgage backed securities
|
|||||||||
| Investment Securities [Abstract] | |||||||||
| Available-for-sale, amortized cost | 37 | 40 | |||||||
| Available-for-sale, fair value | 37 | 40 | |||||||
| Other than Temporary Impairment Losses, Investments [Abstract] | |||||||||
| OTTI losses related to non-agency mortgage-backed AFS securities | 0 | 2 | |||||||
|
U.S. Government and agencies
|
|||||||||
| Investment Securities [Abstract] | |||||||||
| Available-for-sale, amortized cost | 403 | 390 | |||||||
| Available-for-sale, fair value | $ 403 | $ 390 | |||||||
|
|||||||||