v3.3.1.900
Segment Information - Schedule of Investment Advisory, Administration Fees, Securities Lending Revenue and Performance Fees, BlackRock Solutions and Advisory Revenue, Distribution Fees and Other Revenue (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Total investment advisory, administration fees, securities lending revenue and performance fees                 $ 10,461 $ 10,139 $ 9,300
BlackRock Solutions and advisory                 646 635 577
Distribution fees                 55 70 73
Other revenue                 239 237 230
Total revenue $ 2,863 $ 2,910 $ 2,905 $ 2,723 $ 2,784 $ 2,849 $ 2,778 $ 2,670 11,401 11,081 10,180
Equity Securities [Member]                      
Segment Reporting Information [Line Items]                      
Total investment advisory, administration fees, securities lending revenue and performance fees                 5,345 5,337 4,816
Fixed Income [Member]                      
Segment Reporting Information [Line Items]                      
Total investment advisory, administration fees, securities lending revenue and performance fees                 2,428 2,171 1,996
Multi-asset [Member]                      
Segment Reporting Information [Line Items]                      
Total investment advisory, administration fees, securities lending revenue and performance fees                 1,287 1,236 1,063
Alternatives [Member]                      
Segment Reporting Information [Line Items]                      
Total investment advisory, administration fees, securities lending revenue and performance fees                 1,082 1,103 1,104
Cash Management [Member]                      
Segment Reporting Information [Line Items]                      
Total investment advisory, administration fees, securities lending revenue and performance fees                 $ 319 $ 292 $ 321