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Total Equity and Other Comprehensive Income (Change in Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Total Equity And Other Comprehensive Income [Abstract]        
Net unrealized gains on non-OTTI securities beginning balance, after-tax $ 846 $ 112 $ 696 $ 95
Increase in net unrealized gains losses for non-OTTI securities, Pretax 220 597 521 662
Increase in net unrealized gains losses for non-OTTI securities, Tax (81) (215) (192) (239)
Increase in net unrealized gains losses for non-OTTI securities, After-tax 139 382 329 423
Less: net gains realized in net income, Pretax 62 116 125 153
Less: net gains realized in net income, Tax (23) (41) (46) (54)
Less: net gains realized in net income. After-tax 39 75 79 99
Net unrealized gains on non-OTTI securities 158 481 396 509
Net unrealized gains on non-OTTI securities, Tax (58) (174) (146) (185)
Net unrealized gains on non-OTTI securities, After-tax 100 307 250 324
Net unrealized gains on non-OTTI securities ending balance, after-tax 946 419 946 419
Net unrealized gains (losses) on OTTI securities, After-tax, Beginning Balance (481) (499) (738) (646)
Net increase in OTTI losses on debt securities, pretax (26) (117) 336 80
Net increase in OTTI losses on debt securities, Tax 10 49 (123) (23)
Net increase in OTTI losses on debt securities, After-tax (16) (68) 213 57
Less: Net losses realized on sale of securities, Pretax   (34) (6) (34)
Less: Net losses realized on sale of securities, Tax   12 2 12
Less: Net losses realized on sale of securities After-tax   (22) (4) (22)
Less: Net OTTI losses realized in net income (34) (39) (72) (73)
Less: Net OTTI losses realized in net income, Tax 13 14 27 26
Less: Net OTTI losses realized in net income, After-tax (21) (25) (45) (47)
Net unrealized gains (losses) on OTTI securities, Pretax 8 (44) 414 187
Net unrealized gains (losses) on OTTI securities, Tax (3) 23 (152) (61)
Net unrealized gains (losses) on OTTI securities, After-tax 5 (21) 262 126
Net unrealized gains (losses) on OTTI securities, After-tax, Ending Balance (476) (520) (476) (520)
Net unrealized gains (losses) on cash flow hedge derivatives, Beginning Balance, After-tax 660 454 717 522
Increase in net unrealized gains on cash flow hedge derivatives, Pretax 154 266 207 280
Increase in net unrealized gains on cash flow hedge derivatives, Tax (57) (98) (76) (103)
Increase in net unrealized gains on cash flow hedge derivatives, After-tax 97 168 131 177
Less: net gains realized in net income, Pretax 148 123 291 245
Less: net gains realized in net income, Tax (55) (45) (107) (90)
Less: net gains realized in net income, After-tax 93 78 184 155
Net unrealized gains losses on cash flow hedge derivatives 6 143 (84) 35
Net unrealized gains losses on cash flow hedge derivatives, Tax (2) (53) 31 (13)
Net unrealized gains losses on cash flow hedge derivatives, After-tax 4 90 (53) 22
Net unrealized gains (losses) on cash flow hedge derivatives, Ending Balance, After-tax 664 544 664 544
Pension and other postretirement benefit plan adjustments, after-tax, beginning balance (724) (370) (755) (380)
Pension and other postretirement benefit plan adjustments 39 (5) 87 11
Change in pension and other postretirement benefit plan adjustments, Tax (15) 2 (32) (4)
Change in pension and other postretirement benefit plan adjustments, After-tax 24 (3) 55 7
Pension and other postretirement benefit plan adjustments, after-tax, ending balance (700) (373) (700) (373)
Other Accumulated Other Comprehensive Income Balance, beginning balance (20) [1] (6) [1] (25) [1] (22) [1]
Foreign currency transaction adjustment, Pretax (30) [1] 6 [1] (18) [1] 39 [1]
Foreign currency transaction adjustment, Tax 11 [1] (1) 7 [1] (18)
Foreign currency transaction adjustment, After-tax (19) [1] 5 [1] (11) [1] 21 [1]
BlackRock deferred tax adjustment, Tax 7 [1]   4 [1]  
BlackRock deferred tax adjustment, After-tax 7 [1]   4 [1]  
Other (30) [1] 6 [1] (18) [1] 39 [1]
Change in other, net Tax 18 [1] (1) [1] 11 [1] (18) [1]
Change in other, net After-tax (12) [1] 5 [1] (7) [1] 21 [1]
Other Accumulated Other Comprehensive Income Balance, ending balance $ (32) [1] $ (1) [1] $ (32) [1] $ (1) [1]
[1] Consists of foreign currency translation adjustments and deferred tax adjustments on BlackRock's other comprehensive income in 2012.