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Variable Interest Entities (Narrative) (Details) (USD $) In Millions | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010 | Jun. 30, 2011 Variable Interest Entity, Primary Beneficiary [Member] | Jun. 30, 2011 Variable Interest Entity, Primary Beneficiary [Member] | Jun. 30, 2010 Variable Interest Entity, Primary Beneficiary [Member] | Dec. 31, 2010 Variable Interest Entity, Primary Beneficiary [Member]
Carrying amounts of assets | $ 33,464 | $ 31,668 | $ 33,464 | $ 32,279 | $ 13,700 | $ 13,700 |  | $ 14,100
Carrying amount of liabilities |  | 29,763 |  | 29,433 | 13,000 | 13,000 |  | 13,100
Other net realized gains (losses) on initial consolidation |  |  |  |  |  | 0 |  |
Other net realized gains (losses) | 19 | 5 | 19 |  | 3 | 3 | (74) |
Net realized gains related to deconsolidation |  |  |  |  |  | $ 3 | $ 0 |

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