Derivative Instruments - Credit Derivatives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Credit Derivatives - supplemental information
Tranche credit default swap realized credit loss protection	$ 1,000,000
Tranche credit default swap portfolio of exposure	10,000,000
Total credit derivatives and credit-related notes
Protection sold	(575,178,000,000)	$ (612,733,000,000)
Protection purchased with identical underlyings	611,909,000,000	618,433,000,000
Net protection (sold)/purchased	36,731,000,000	5,700,000,000
Other protection purchased	23,664,000,000	20,906,000,000
Total credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(575,178,000,000)	(612,733,000,000)
Protection purchased with identical underlyings	611,909,000,000	618,433,000,000
Net protection (sold)/purchased	36,731,000,000	5,700,000,000
Other protection purchased	13,416,000,000	11,300,000,000
Credit default swaps
Total credit derivatives and credit-related notes
Protection sold	(535,094,000,000)	(562,338,000,000)
Protection purchased with identical underlyings	554,565,000,000	571,892,000,000
Net protection (sold)/purchased	19,471,000,000	9,554,000,000
Other protection purchased	4,001,000,000	3,936,000,000
Other credit derivatives
Total credit derivatives and credit-related notes
Protection sold	(40,084,000,000)	(50,395,000,000)
Protection purchased with identical underlyings	57,344,000,000	46,541,000,000
Net protection (sold)/purchased	17,260,000,000	(3,854,000,000)
Other protection purchased	9,415,000,000	7,364,000,000
Credit-related notes
Total credit derivatives and credit-related notes
Protection sold	0	0
Protection purchased with identical underlyings	0	0
Net protection (sold)/purchased	0	0
Other protection purchased	$ 10,248,000,000	$ 9,606,000,000