Derivatives and Hedge Accounting - Derivatives not designated as hedging instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net realized gains/(losses) | Fortitude Re funds withheld assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 2,824	$ (1,996)	$ 6,086	$ 269
Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	4,255	(2,356)	8,972	342
Derivatives not designated as hedging instruments | Policy fees
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	15	15	30	30
Derivatives not designated as hedging instruments | Net investment income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	3	7	2	(5)
Derivatives not designated as hedging instruments | Net realized gains/(losses) | Excluding Fortitude Re Funds Withheld Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	1,420	(388)	2,868	52
Derivatives not designated as hedging instruments | Policyholder benefits and claims incurred
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(7)	6	(14)	(4)
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(869)	856	(1,482)	(689)
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	730	48	966	(39)
Derivatives not designated as hedging instruments | Equity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	78	(32)	(126)	(551)
Derivatives not designated as hedging instruments | Commodity contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(3)	1	(7)	1
Derivatives not designated as hedging instruments | Credit contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	(4)	(1)	(9)
Derivatives not designated as hedging instruments | Other contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	13	17	31	32
Derivatives not designated as hedging instruments | Embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 4,306	$ (3,242)	$ 9,591	$ 1,597