Derivative Instruments and Hedging Activities - Fair Value Asset/(Liability) of Credit Protection Sold (Details) - Credit Protection Sold - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Credit Derivatives
Fair Value Asset (Liability)	$ (320)	$ 1,798
CDS
Credit Derivatives
Fair Value Asset (Liability)	(317)	1,801
Single-name CDS
Credit Derivatives
Fair Value Asset (Liability)	(496)	1,058
Single-name CDS | Investment grade
Credit Derivatives
Fair Value Asset (Liability)	1,309	1,428
Single-name CDS | Non-investment grade
Credit Derivatives
Fair Value Asset (Liability)	(1,805)	(370)
Index and basket CDS
Credit Derivatives
Fair Value Asset (Liability)	179	743
Index and basket CDS | Investment grade
Credit Derivatives
Fair Value Asset (Liability)	1,422	1,393
Index and basket CDS | Non-investment grade
Credit Derivatives
Fair Value Asset (Liability)	(1,243)	(650)
Other credit contracts
Credit Derivatives
Fair Value Asset (Liability)	$ (3)	$ (3)