Derivatives and Hedge Accounting - Notional amounts and fair values of derivative instruments (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Gross Derivative Assets
Notional Amount	$ 133,721,000,000	$ 136,508,000,000
Fair Value	6,049,000,000	5,761,000,000
Counterparty netting	(3,895,000,000)	(2,779,000,000)
Cash Collateral	(1,640,000,000)	(2,139,000,000)
Total derivative assets	514,000,000	843,000,000
Gross Derivative Liabilities
Notional Amount	56,805,000,000	65,130,000,000
Fair Value	6,043,000,000	4,454,000,000
Counterparty netting	(3,895,000,000)	(2,779,000,000)
Cash Collateral	(1,917,000,000)	(1,089,000,000)
Total derivative liabilities on consolidated balance sheet	231,000,000	586,000,000
Bifurcated embedded derivatives assets, fair value	2,200,000,000	0
Bifurcated embedded derivative liabilities, fair value	7,200,000,000	14,500,000,000
Derivatives designated as hedging instruments | Interest rate contracts
Gross Derivative Assets
Notional Amount	251,000,000	265,000,000
Fair Value	355,000,000	5,000,000
Gross Derivative Liabilities
Notional Amount	1,688,000,000	895,000,000
Fair Value	66,000,000	11,000,000
Derivatives designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	4,543,000,000	5,431,000,000
Fair Value	642,000,000	467,000,000
Gross Derivative Liabilities
Notional Amount	4,899,000,000	5,828,000,000
Fair Value	317,000,000	197,000,000
Derivatives not designated as hedging instruments | Interest rate contracts
Gross Derivative Assets
Notional Amount	39,833,000,000	47,499,000,000
Fair Value	3,367,000,000	3,868,000,000
Gross Derivative Liabilities
Notional Amount	34,128,000,000	42,113,000,000
Fair Value	4,772,000,000	3,622,000,000
Derivatives not designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	8,626,000,000	7,905,000,000
Fair Value	1,202,000,000	722,000,000
Gross Derivative Liabilities
Notional Amount	10,397,000,000	9,997,000,000
Fair Value	821,000,000	524,000,000
Derivatives not designated as hedging instruments | Equity contracts
Gross Derivative Assets
Notional Amount	31,264,000,000	27,423,000,000
Fair Value	428,000,000	681,000,000
Gross Derivative Liabilities
Notional Amount	4,740,000,000	5,091,000,000
Fair Value	26,000,000	53,000,000
Derivatives not designated as hedging instruments | Commodity contracts
Gross Derivative Assets
Notional Amount	212,000,000	303,000,000
Fair Value	9,000,000	4,000,000
Gross Derivative Liabilities
Notional Amount	20,000,000	219,000,000
Fair Value	0	0
Derivatives not designated as hedging instruments | Credit contracts
Gross Derivative Assets
Notional Amount	1,808,000,000	3,790,000,000
Fair Value	32,000,000	1,000,000
Gross Derivative Liabilities
Notional Amount	933,000,000	936,000,000
Fair Value	41,000,000	47,000,000
Derivatives not designated as hedging instruments | Credit contracts | CDS
Gross Derivative Liabilities
Notional Amount	79,000,000	97,000,000
Fair Value	32,000,000	30,000,000
Derivatives not designated as hedging instruments | Other contracts
Gross Derivative Assets
Notional Amount	47,184,000,000	43,892,000,000
Fair Value	14,000,000	13,000,000
Gross Derivative Liabilities
Notional Amount	0	51,000,000
Fair Value	$ 0	$ 0