Derivatives and Hedge Accounting - Notional amounts and fair values of derivative instruments (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Gross Derivative Assets
Notional Amount	$ 147,560,000,000	$ 136,508,000,000
Fair Value	7,137,000,000	5,761,000,000
Counterparty netting	(4,354,000,000)	(2,779,000,000)
Cash Collateral	(2,426,000,000)	(2,139,000,000)
Total derivative assets	357,000,000	843,000,000
Gross Derivative Liabilities
Notional Amount	68,979,000,000	65,130,000,000
Fair Value	7,052,000,000	4,454,000,000
Counterparty netting	(4,354,000,000)	(2,779,000,000)
Cash Collateral	(2,418,000,000)	(1,089,000,000)
Total derivative liabilities on consolidated balance sheet	280,000,000	586,000,000
Bifurcated embedded derivatives assets, fair value	600,000,000	0
Bifurcated embedded derivative liabilities, fair value	7,000,000,000	14,500,000,000
Derivatives designated as hedging instruments | Interest rate contracts
Gross Derivative Assets
Notional Amount	85,000,000	265,000,000
Fair Value	2,000,000	5,000,000
Gross Derivative Liabilities
Notional Amount	925,000,000	895,000,000
Fair Value	35,000,000	11,000,000
Derivatives designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	8,027,000,000	5,431,000,000
Fair Value	870,000,000	467,000,000
Gross Derivative Liabilities
Notional Amount	1,956,000,000	5,828,000,000
Fair Value	217,000,000	197,000,000
Derivatives not designated as hedging instruments | Interest rate contracts
Gross Derivative Assets
Notional Amount	49,436,000,000	47,499,000,000
Fair Value	4,609,000,000	3,868,000,000
Gross Derivative Liabilities
Notional Amount	56,712,000,000	42,113,000,000
Fair Value	6,272,000,000	3,622,000,000
Derivatives not designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	13,408,000,000	7,905,000,000
Fair Value	1,243,000,000	722,000,000
Gross Derivative Liabilities
Notional Amount	3,639,000,000	9,997,000,000
Fair Value	431,000,000	524,000,000
Derivatives not designated as hedging instruments | Equity contracts
Gross Derivative Assets
Notional Amount	29,116,000,000	27,423,000,000
Fair Value	387,000,000	681,000,000
Gross Derivative Liabilities
Notional Amount	4,710,000,000	5,091,000,000
Fair Value	53,000,000	53,000,000
Derivatives not designated as hedging instruments | Commodity contracts
Gross Derivative Assets
Notional Amount	271,000,000	303,000,000
Fair Value	9,000,000	4,000,000
Gross Derivative Liabilities
Notional Amount	104,000,000	219,000,000
Fair Value	0	0
Derivatives not designated as hedging instruments | Credit contracts
Gross Derivative Assets
Notional Amount	1,789,000,000	3,790,000,000
Fair Value	1,000,000	1,000,000
Gross Derivative Liabilities
Notional Amount	933,000,000	936,000,000
Fair Value	44,000,000	47,000,000
Derivatives not designated as hedging instruments | Credit contracts | CDS
Gross Derivative Liabilities
Notional Amount	93,000,000	97,000,000
Fair Value	32,000,000	30,000,000
Derivatives not designated as hedging instruments | Other contracts
Gross Derivative Assets
Notional Amount	45,428,000,000	43,892,000,000
Fair Value	16,000,000	13,000,000
Gross Derivative Liabilities
Notional Amount	0	51,000,000
Fair Value	$ 0	$ 0