Fair value measurement - Assets and Liabilities on Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	$ 91,278	$ 101,839
Trading assets:
Total derivatives fair value	12,973	9,793
Effect of master netting agreements	(9,379)	(6,973)
Total derivative assets	3,594	2,820
Trading assets	10,759	16,577
Other assets	1,268	1,187
Trading liabilities:
Total derivatives fair value	12,284	9,759
Effect of master netting agreements	(9,854)	(6,335)
Derivative liabilities	2,430	3,424
Other liabilities	31	496
Interest rate contracts
Trading assets:
Effect of master netting agreements	(920)	(1,424)
Trading liabilities:
Effect of master netting agreements	(1,255)	(2,028)
Foreign exchange contracts
Trading assets:
Effect of master netting agreements	(8,387)	(5,501)
Trading liabilities:
Effect of master netting agreements	(8,563)	(4,111)
Equity contracts
Trading assets:
Effect of master netting agreements	(72)	(48)
Trading liabilities:
Effect of master netting agreements	(36)	(196)
U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	30,467	29,409
Sovereign debt/sovereign guaranteed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	11,092	13,379
Agency residential mortgage-backed securities (“RMBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	8,303	14,530
Agency commercial mortgage-backed securities (“MBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	8,179	8,405
Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	7,548	7,573
Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	5,828	6,238
Collateralized loan obligations (“CLOs”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	5,097	4,439
Non-agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	2,311	2,748
U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1,925	2,536
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	2,023	2,514
Other asset-backed securities (“ABS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1,668	2,190
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1,297	2,066
Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1	1
Not designated as hedging
Trading assets:
Total derivatives fair value	12,448	9,587
Trading liabilities:
Total derivatives fair value	12,254	9,266
Not designated as hedging | Interest rate contracts
Trading assets:
Total derivatives fair value	1,650	3,259
Trading liabilities:
Total derivatives fair value	1,773	2,835
Not designated as hedging | Foreign exchange contracts
Trading assets:
Total derivatives fair value	10,555	6,279
Trading liabilities:
Total derivatives fair value	10,426	6,215
Not designated as hedging | Equity contracts
Trading assets:
Total derivatives fair value	243	49
Trading liabilities:
Total derivatives fair value	52	211
Designated as hedging
Trading assets:
Total derivatives fair value	525	206
Trading liabilities:
Total derivatives fair value	30	493
Designated as hedging | Interest rate contracts
Trading assets:
Total derivatives fair value	57	0
Trading liabilities:
Total derivatives fair value	3	453
Designated as hedging | Foreign exchange contracts
Trading assets:
Total derivatives fair value	468	206
Trading liabilities:
Total derivatives fair value	27	40
Measured at fair value on a recurring basis | Operating segments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	91,278	101,839
Trading assets:
Debt instruments	2,262	4,197
Equity instruments	5,428	9,766
Effect of master netting agreements	(9,379)	(6,973)
Trading assets	10,759	16,577
Other assets	520	763
Total other assets	1,045	969
Total assets	103,305	119,603
Trading liabilities:
Total trading liabilities	5,595	5,469
Effect of master netting agreements	(9,854)	(6,335)
Derivative liabilities	30
Other liabilities	1	3
Total other liabilities	31	496
Total liabilities	5,626	5,965
Measured at fair value on a recurring basis | Operating segments | Interest rate contracts
Trading assets:
Effect of master netting agreements	(920)	(1,424)
Trading liabilities:
Effect of master netting agreements	(1,255)	(2,028)
Measured at fair value on a recurring basis | Operating segments | Foreign exchange contracts
Trading assets:
Effect of master netting agreements	(8,387)	(5,501)
Trading liabilities:
Effect of master netting agreements	(8,563)	(4,111)
Measured at fair value on a recurring basis | Operating segments | Equity contracts
Trading assets:
Effect of master netting agreements	(72)	(48)
Trading liabilities:
Effect of master netting agreements	(36)	(196)
Measured at fair value on a recurring basis | Operating segments | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	30,467	29,409
Measured at fair value on a recurring basis | Operating segments | Sovereign debt/sovereign guaranteed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	11,092	13,379
Measured at fair value on a recurring basis | Operating segments | Agency residential mortgage-backed securities (“RMBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	8,303	14,530
Measured at fair value on a recurring basis | Operating segments | Agency commercial mortgage-backed securities (“MBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	8,179	8,405
Measured at fair value on a recurring basis | Operating segments | Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	7,548	7,573
Measured at fair value on a recurring basis | Operating segments | Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	5,828	6,238
Measured at fair value on a recurring basis | Operating segments | Collateralized loan obligations (“CLOs”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	5,097	4,439
Measured at fair value on a recurring basis | Operating segments | Non-agency commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	3,003	3,125
Measured at fair value on a recurring basis | Operating segments | Foreign government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	2,536	2,686
Measured at fair value on a recurring basis | Operating segments | Non-agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	2,311	2,748
Measured at fair value on a recurring basis | Operating segments | U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1,925	2,536
Measured at fair value on a recurring basis | Operating segments | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	2,023	2,514
Measured at fair value on a recurring basis | Operating segments | Other asset-backed securities (“ABS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1,668	2,190
Measured at fair value on a recurring basis | Operating segments | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1,297	2,066
Measured at fair value on a recurring basis | Operating segments | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1	1
Measured at fair value on a recurring basis | Operating segments | Not designated as hedging
Trading assets:
Total derivative assets	3,069	2,614
Trading liabilities:
Derivative liabilities	2,400	2,931
Measured at fair value on a recurring basis | Operating segments | Not designated as hedging | Interest rate contracts
Trading assets:
Total derivative assets	730	1,835
Trading liabilities:
Derivative liabilities	518	807
Measured at fair value on a recurring basis | Operating segments | Not designated as hedging | Foreign exchange contracts
Trading assets:
Total derivative assets	2,168	778
Trading liabilities:
Derivative liabilities	1,863	2,104
Measured at fair value on a recurring basis | Operating segments | Not designated as hedging | Equity contracts
Trading assets:
Total derivative assets	171	1
Trading liabilities:
Derivative liabilities	19	20
Measured at fair value on a recurring basis | Operating segments | Designated as hedging
Trading assets:
Total derivative assets	525	206
Trading liabilities:
Derivative liabilities		493
Measured at fair value on a recurring basis | Operating segments | Designated as hedging | Interest rate contracts
Trading assets:
Total derivative assets	57
Trading liabilities:
Derivative liabilities	3	453
Measured at fair value on a recurring basis | Operating segments | Designated as hedging | Foreign exchange contracts
Trading assets:
Total derivative assets	468	206
Trading liabilities:
Derivative liabilities	27	40
Measured at fair value on a recurring basis | Operating segments | Debt instruments
Trading liabilities:
Total trading liabilities	3,105	2,498
Measured at fair value on a recurring basis | Operating segments | Equity instruments
Trading liabilities:
Total trading liabilities	90	40
Measured at fair value on a recurring basis | Operating segments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	35,400	35,426
Trading assets:
Debt instruments	1,059	1,447
Equity instruments	5,428	9,766
Trading assets	6,508	11,219
Other assets	285	438
Total other assets	285	438
Total assets	$ 42,193	$ 47,083
Percentage of total assets prior to netting	38.00%	37.00%
Trading liabilities:
Total trading liabilities	$ 3,165	$ 2,498
Total derivatives fair value	0
Other liabilities	0	1
Total other liabilities	0	1
Total liabilities	$ 3,165	$ 2,499
Percentage of total liabilities prior to netting	20.00%	20.00%
Measured at fair value on a recurring basis | Operating segments | Level 1 | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	$ 30,467	$ 29,409
Measured at fair value on a recurring basis | Operating segments | Level 1 | Sovereign debt/sovereign guaranteed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	4,933	6,017
Measured at fair value on a recurring basis | Operating segments | Level 1 | Agency residential mortgage-backed securities (“RMBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Agency commercial mortgage-backed securities (“MBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Collateralized loan obligations (“CLOs”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Non-agency commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Foreign government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Non-agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Other asset-backed securities (“ABS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Not designated as hedging
Trading assets:
Total derivatives fair value	21	6
Trading liabilities:
Total derivatives fair value	8	6
Measured at fair value on a recurring basis | Operating segments | Level 1 | Not designated as hedging | Interest rate contracts
Trading assets:
Total derivatives fair value	18	6
Trading liabilities:
Total derivatives fair value	7	1
Measured at fair value on a recurring basis | Operating segments | Level 1 | Not designated as hedging | Foreign exchange contracts
Trading assets:
Total derivatives fair value	0	0
Trading liabilities:
Total derivatives fair value	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Not designated as hedging | Equity contracts
Trading assets:
Total derivatives fair value	3	0
Trading liabilities:
Total derivatives fair value	1	5
Measured at fair value on a recurring basis | Operating segments | Level 1 | Designated as hedging
Trading assets:
Total derivatives fair value	0	0
Trading liabilities:
Total derivatives fair value		0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Designated as hedging | Interest rate contracts
Trading assets:
Total derivatives fair value	0
Trading liabilities:
Total derivatives fair value	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Designated as hedging | Foreign exchange contracts
Trading assets:
Total derivatives fair value	0	0
Trading liabilities:
Total derivatives fair value	0	0
Measured at fair value on a recurring basis | Operating segments | Level 1 | Debt instruments
Trading liabilities:
Total trading liabilities	3,067	2,452
Measured at fair value on a recurring basis | Operating segments | Level 1 | Equity instruments
Trading liabilities:
Total trading liabilities	90	40
Measured at fair value on a recurring basis | Operating segments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	55,878	66,413
Trading assets:
Debt instruments	1,203	2,750
Equity instruments	0	0
Trading assets	13,630	12,331
Other assets	235	325
Total other assets	760	531
Total assets	$ 70,268	$ 79,275
Percentage of total assets prior to netting	62.00%	63.00%
Trading liabilities:
Total trading liabilities	$ 12,284	$ 9,306
Total derivatives fair value	30
Other liabilities	1	2
Total other liabilities	31	495
Total liabilities	$ 12,315	$ 9,801
Percentage of total liabilities prior to netting	80.00%	80.00%
Measured at fair value on a recurring basis | Operating segments | Level 2 | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	$ 0	$ 0
Measured at fair value on a recurring basis | Operating segments | Level 2 | Sovereign debt/sovereign guaranteed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	6,159	7,362
Measured at fair value on a recurring basis | Operating segments | Level 2 | Agency residential mortgage-backed securities (“RMBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	8,303	14,530
Measured at fair value on a recurring basis | Operating segments | Level 2 | Agency commercial mortgage-backed securities (“MBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	8,179	8,405
Measured at fair value on a recurring basis | Operating segments | Level 2 | Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	7,548	7,573
Measured at fair value on a recurring basis | Operating segments | Level 2 | Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	5,828	6,238
Measured at fair value on a recurring basis | Operating segments | Level 2 | Collateralized loan obligations (“CLOs”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	5,097	4,439
Measured at fair value on a recurring basis | Operating segments | Level 2 | Non-agency commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	3,003	3,125
Measured at fair value on a recurring basis | Operating segments | Level 2 | Foreign government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	2,536	2,686
Measured at fair value on a recurring basis | Operating segments | Level 2 | Non-agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	2,311	2,748
Measured at fair value on a recurring basis | Operating segments | Level 2 | U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1,925	2,536
Measured at fair value on a recurring basis | Operating segments | Level 2 | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	2,023	2,514
Measured at fair value on a recurring basis | Operating segments | Level 2 | Other asset-backed securities (“ABS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1,668	2,190
Measured at fair value on a recurring basis | Operating segments | Level 2 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1,297	2,066
Measured at fair value on a recurring basis | Operating segments | Level 2 | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	1	1
Measured at fair value on a recurring basis | Operating segments | Level 2 | Not designated as hedging
Trading assets:
Total derivatives fair value	12,427	9,581
Trading liabilities:
Total derivatives fair value	12,246	9,260
Measured at fair value on a recurring basis | Operating segments | Level 2 | Not designated as hedging | Interest rate contracts
Trading assets:
Total derivatives fair value	1,632	3,253
Trading liabilities:
Total derivatives fair value	1,766	2,834
Measured at fair value on a recurring basis | Operating segments | Level 2 | Not designated as hedging | Foreign exchange contracts
Trading assets:
Total derivatives fair value	10,555	6,279
Trading liabilities:
Total derivatives fair value	10,426	6,215
Measured at fair value on a recurring basis | Operating segments | Level 2 | Not designated as hedging | Equity contracts
Trading assets:
Total derivatives fair value	240	49
Trading liabilities:
Total derivatives fair value	54	211
Measured at fair value on a recurring basis | Operating segments | Level 2 | Designated as hedging
Trading assets:
Total derivatives fair value	525	206
Trading liabilities:
Total derivatives fair value		493
Measured at fair value on a recurring basis | Operating segments | Level 2 | Designated as hedging | Interest rate contracts
Trading assets:
Total derivatives fair value	57
Trading liabilities:
Total derivatives fair value	3	453
Measured at fair value on a recurring basis | Operating segments | Level 2 | Designated as hedging | Foreign exchange contracts
Trading assets:
Total derivatives fair value	468	206
Trading liabilities:
Total derivatives fair value	27	40
Measured at fair value on a recurring basis | Operating segments | Level 2 | Debt instruments
Trading liabilities:
Total trading liabilities	38	46
Measured at fair value on a recurring basis | Operating segments | Level 2 | Equity instruments
Trading liabilities:
Total trading liabilities	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Trading assets:
Debt instruments	0	0
Equity instruments	0	0
Trading assets	0	0
Other assets	0	0
Total other assets	0	0
Total assets	$ 0	$ 0
Percentage of total assets prior to netting	0.00%	0.00%
Trading liabilities:
Total trading liabilities	$ 0	$ 0
Total derivatives fair value	0
Other liabilities	0	0
Total other liabilities	0	0
Total liabilities	$ 0	$ 0
Percentage of total liabilities prior to netting	0.00%	0.00%
Measured at fair value on a recurring basis | Operating segments | Level 3 | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	$ 0	$ 0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Sovereign debt/sovereign guaranteed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Agency residential mortgage-backed securities (“RMBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Agency commercial mortgage-backed securities (“MBS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Collateralized loan obligations (“CLOs”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Non-agency commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Foreign government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Non-agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Other asset-backed securities (“ABS”)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Other debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale, amount	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Not designated as hedging
Trading assets:
Total derivatives fair value	0	0
Trading liabilities:
Total derivatives fair value	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Not designated as hedging | Interest rate contracts
Trading assets:
Total derivatives fair value	0	0
Trading liabilities:
Total derivatives fair value	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Not designated as hedging | Foreign exchange contracts
Trading assets:
Total derivatives fair value	0	0
Trading liabilities:
Total derivatives fair value	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Not designated as hedging | Equity contracts
Trading assets:
Total derivatives fair value	0	0
Trading liabilities:
Total derivatives fair value	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Designated as hedging
Trading assets:
Total derivatives fair value	0	0
Trading liabilities:
Total derivatives fair value		0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Designated as hedging | Interest rate contracts
Trading assets:
Total derivatives fair value	0
Trading liabilities:
Total derivatives fair value	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Designated as hedging | Foreign exchange contracts
Trading assets:
Total derivatives fair value	0	0
Trading liabilities:
Total derivatives fair value	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Debt instruments
Trading liabilities:
Total trading liabilities	0	0
Measured at fair value on a recurring basis | Operating segments | Level 3 | Equity instruments
Trading liabilities:
Total trading liabilities	0	0
Measured at fair value on a recurring basis | Operating segments | NAV
Trading assets:
Assets measured at NAV	$ 223	$ 218