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Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Total Equity And Other Comprehensive Income [Abstract]        
Net unrealized securities gains (losses), after-tax $ 696 $ 95    
OTTI losses on debt securities, after-tax (738) (646)    
Net unrealized gains on cash flow hedge derivatives, after-tax 717 522 166 374
Pension, other postretirement and postemployment benefit plan adjustments, after-tax (755) (380) (542) (667)
Other ,net After-tax (25) [1] (22) [1] (10) [1] (30) [1]
Accumulated other comprehensive income (loss), after-tax $ (105) $ (431)    
[1] Consists of foreign currency translation adjustments, deferred tax adjustments on BlackRock’s other comprehensive income, and for 2010 and 2009, interest-only strip valuation adjustments.