Regulatory Requirements - The Firm's Regulatory Capital and Capital Ratios (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Required Ratio
Common Equity Tier 1 capital (as a percent)	13.20%	10.00%
Tier 1 capital (as a percent)	0.147	0.115
Total capital (as a percent)	0.167	0.135
Tier 1 leverage (as a percent)	0.040	0.040
SLR (as a percent)	5.00%	5.00%
Amount
Common Equity Tier 1 capital	$ 78,650	$ 64,751
Tier 1 capital	88,079	73,443
Total capital	97,213	82,708
Total RWA	453,106	394,177
Adjusted average assets	1,053,310	889,195
Supplementary leverage exposure	$ 1,192,506	$ 1,155,177
Ratio
Common Equity Tier 1 capital (as a percent)	0.174	0.164
Tier 1 capital (as a percent)	0.194	0.186
Total capital (as a percent)	0.215	0.210
Tier 1 leverage (as a percent)	0.084	0.083
SLR (as a percent)	0.074	0.064