Derivative Instruments and Hedging Activities - Fair Value Asset/(Liability) of Credit Protection Sold (Details) - Credit Protection Sold - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Credit Derivatives
Fair Value Asset (Liability)	$ 1,798	$ 1,223
CDS
Credit Derivatives
Fair Value Asset (Liability)	1,801	1,227
Single-name CDS
Credit Derivatives
Fair Value Asset (Liability)	1,058	1,208
Single-name CDS | Investment grade
Credit Derivatives
Fair Value Asset (Liability)	1,428	1,230
Single-name CDS | Non-investment grade
Credit Derivatives
Fair Value Asset (Liability)	(370)	(22)
Index and basket CDS
Credit Derivatives
Fair Value Asset (Liability)	743	19
Index and basket CDS | Investment grade
Credit Derivatives
Fair Value Asset (Liability)	1,393	843
Index and basket CDS | Non-investment grade
Credit Derivatives
Fair Value Asset (Liability)	(650)	(824)
Other credit contracts
Credit Derivatives
Fair Value Asset (Liability)	$ (3)	$ (4)