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Fair Value Measurement - Level 3 Analysis (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Level 3 Analysis - Supplemental Data [Abstract]          
Percentage of level 3 assets in total Firm assets 0.80%   0.80%    
Total realized/unrealized gains/(losses) $ 385 $ 45 $ 1,935 $ 132  
Recurring          
Level 3 Analysis - Supplemental Data [Abstract]          
Assets fair value 657,743   657,743   $ 625,737
Recurring | Level 3          
Level 3 Analysis - Supplemental Data [Abstract]          
Assets fair value 19,031   19,031   $ 19,216
Decrease in level 3 assets 272   185    
Recurring | Level 3 | Liabilities          
Level 3 Analysis - Supplemental Data [Abstract]          
Total realized/unrealized gains/(losses) 100 (387) 722 (1,000)  
Recurring | Level 3 | Assets          
Level 3 Analysis - Supplemental Data [Abstract]          
Total realized/unrealized gains/(losses) $ 394 $ 186 $ 2,100 $ 692