Fair Values - Detail of Loans and Lending Commitments at Fair Value (Details) - Loans and lending commitments - Recurring - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value Measurements
Trading assets	$ 12,689	$ 11,148
Corporate
Fair Value Measurements
Trading assets	14	13
Secured lending facilities
Fair Value Measurements
Trading assets	914	648
Commercial real estate
Fair Value Measurements
Trading assets	347	916
Residential real estate
Fair Value Measurements
Trading assets	2,551	2,145
Securities-based lending and Other loans
Fair Value Measurements
Trading assets	$ 8,863	$ 7,426