Derivatives and Hedge Accounting - Notional amounts and fair values of derivative instruments (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Gross Derivative Assets
Notional Amount	$ 134,364	$ 133,721
Fair Value	5,216	6,049
Counterparty netting	(2,826)	(3,895)
Cash Collateral	(1,980)	(1,640)
Total derivative assets	410	514
Gross Derivative Liabilities
Notional Amount	55,691	56,805
Fair Value	4,293	6,043
Counterparty netting	(2,826)	(3,895)
Cash Collateral	(1,182)	(1,917)
Total derivative liabilities on consolidated balance sheet	285	231
Bifurcated embedded derivatives assets, fair value	2,100	2,200
Bifurcated embedded derivative liabilities, fair value	6,900	5,400
Derivatives designated as hedging instruments | Interest rate contracts
Gross Derivative Assets
Notional Amount	642	251
Fair Value	210	355
Gross Derivative Liabilities
Notional Amount	1,428	1,688
Fair Value	38	66
Derivatives designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	4,978	4,543
Fair Value	530	642
Gross Derivative Liabilities
Notional Amount	3,752	4,899
Fair Value	275	317
Derivatives not designated as hedging instruments | Interest rate contracts
Gross Derivative Assets
Notional Amount	35,331	39,833
Fair Value	2,251	3,367
Gross Derivative Liabilities
Notional Amount	30,855	34,128
Fair Value	3,070	4,772
Derivatives not designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	9,968	8,626
Fair Value	897	1,202
Gross Derivative Liabilities
Notional Amount	10,077	10,397
Fair Value	524	821
Derivatives not designated as hedging instruments | Equity contracts
Gross Derivative Assets
Notional Amount	35,621	31,264
Fair Value	1,280	428
Gross Derivative Liabilities
Notional Amount	9,042	4,740
Fair Value	347	26
Derivatives not designated as hedging instruments | Commodity contracts
Gross Derivative Assets
Notional Amount	0	212
Fair Value	0	9
Gross Derivative Liabilities
Notional Amount	0	20
Fair Value	0	0
Derivatives not designated as hedging instruments | Credit contracts
Gross Derivative Assets
Notional Amount	1,807	1,808
Fair Value	33	32
Gross Derivative Liabilities
Notional Amount	537	933
Fair Value	39	41
Derivatives not designated as hedging instruments | Credit contracts | CDS
Gross Derivative Liabilities
Notional Amount	53	79
Fair Value	32	32
Derivatives not designated as hedging instruments | Other contracts
Gross Derivative Assets
Notional Amount	46,017	47,184
Fair Value	15	14
Gross Derivative Liabilities
Notional Amount	0	0
Fair Value	$ 0	$ 0