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Fair value measurement - Assets and Liabilities on Recurring Basis (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale $ 88,550,000,000 $ 85,809,000,000
Percentage of securities valued with reasonable level of price transparency 99.00%  
Trading assets:    
Total derivatives fair value $ 9,061,000,000 8,754,000,000
Effect of master netting agreements (5,819,000,000) (5,939,000,000)
Total derivative assets 3,242,000,000 2,815,000,000
Trading liabilities:    
Total derivatives fair value 9,206,000,000 8,538,000,000
Effect of master netting agreements (5,415,000,000) (6,170,000,000)
Derivative liabilities 3,791,000,000 2,368,000,000
Long-term debt 387,000,000 371,000,000
Investment management funds    
Trading assets:    
Trading assets 229,000,000 243,000,000
Other assets 16,000,000 220,000,000
Total assets 245,000,000 463,000,000
Trading liabilities:    
Total liabilities 1,000,000 2,000,000
Interest rate contracts    
Trading assets:    
Effect of master netting agreements (1,792,000,000) (2,202,000,000)
Trading liabilities:    
Effect of master netting agreements (1,986,000,000) (2,508,000,000)
Foreign exchange contracts    
Trading assets:    
Effect of master netting agreements (4,021,000,000) (3,724,000,000)
Trading liabilities:    
Effect of master netting agreements (3,428,000,000) (3,626,000,000)
Equity contracts    
Trading assets:    
Effect of master netting agreements (6,000,000) (13,000,000)
Trading liabilities:    
Effect of master netting agreements (1,000,000) (36,000,000)
Agency RMBS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 27,043,000,000 25,308,000,000
U.S. Treasury    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 15,431,000,000 20,076,000,000
Sovereign debt/sovereign guaranteed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 12,646,000,000 10,750,000,000
Agency commercial mortgage-backed securities (“MBS”)    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 9,417,000,000 9,691,000,000
Foreign covered bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 4,197,000,000 2,878,000,000
CLOs    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 4,063,000,000 3,364,000,000
Supranational    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 3,709,000,000 2,984,000,000
Other ABS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,143,000,000 1,773,000,000
U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,949,000,000 1,657,000,000
Non-agency RMBS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,233,000,000 1,325,000,000
State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,044,000,000 2,247,000,000
Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 853,000,000 1,054,000,000
Other debt securities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,000,000 77,000,000
Not designated as hedging    
Trading assets:    
Total derivatives fair value 9,040,000,000 8,465,000,000
Trading liabilities:    
Total derivatives fair value 8,599,000,000 8,450,000,000
Not designated as hedging | Interest rate contracts    
Trading assets:    
Total derivatives fair value 3,690,000,000 3,590,000,000
Trading liabilities:    
Total derivatives fair value 3,250,000,000 3,116,000,000
Not designated as hedging | Foreign exchange contracts    
Trading assets:    
Total derivatives fair value 5,331,000,000 4,807,000,000
Trading liabilities:    
Total derivatives fair value 5,340,000,000 5,215,000,000
Not designated as hedging | Equity contracts    
Trading assets:    
Total derivatives fair value 19,000,000 68,000,000
Trading liabilities:    
Total derivatives fair value 5,000,000 118,000,000
Designated as hedging    
Trading assets:    
Total derivatives fair value 21,000,000 289,000,000
Trading liabilities:    
Total derivatives fair value 607,000,000 88,000,000
Designated as hedging | Interest rate contracts    
Trading assets:    
Total derivatives fair value 0 23,000,000
Trading liabilities:    
Total derivatives fair value 350,000,000 74,000,000
Designated as hedging | Foreign exchange contracts    
Trading assets:    
Total derivatives fair value 21,000,000 266,000,000
Trading liabilities:    
Total derivatives fair value 257,000,000 14,000,000
Operating segments    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 88,550,000,000 85,809,000,000
Trading assets:    
Trading assets 13,571,000,000 7,035,000,000
Other assets 419,000,000 742,000,000
Trading liabilities:    
Long-term debt 387,000,000 371,000,000
Operating segments | Investment management funds    
Trading assets:    
Total assets 245,000,000 463,000,000
Trading liabilities:    
Total liabilities 1,000,000 2,000,000
Assets measured at fair value on a recurring basis    
Trading assets:    
Effect of master netting agreements (5,819,000,000) (5,939,000,000)
Total assets 102,785,000,000 94,049,000,000
Trading liabilities:    
Effect of master netting agreements (5,415,000,000) (6,170,000,000)
Total liabilities 5,836,000,000 3,940,000,000
Assets measured at fair value on a recurring basis | Level 1    
Trading assets:    
Total assets $ 29,576,000,000 $ 28,898,000,000
Percentage of total assets prior to netting 27.00% 29.00%
Trading liabilities:    
Total liabilities $ 1,560,000,000 $ 1,096,000,000
Percentage of total liabilities prior to netting 14.00% 11.00%
Assets measured at fair value on a recurring basis | Level 2    
Trading assets:    
Total assets $ 78,847,000,000 $ 70,875,000,000
Percentage of total assets prior to netting 73.00% 71.00%
Trading liabilities:    
Total liabilities $ 9,691,000,000 $ 9,014,000,000
Percentage of total liabilities prior to netting 86.00% 89.00%
Assets measured at fair value on a recurring basis | Level 2 | Grantor Trust    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale $ 640,000,000 $ 832,000,000
Assets measured at fair value on a recurring basis | Level 3    
Trading assets:    
Total assets $ 0 $ 0
Percentage of total assets prior to netting 0.00% 0.00%
Trading liabilities:    
Total liabilities $ 0 $ 0
Percentage of total liabilities prior to netting 0.00% 0.00%
Assets measured at fair value on a recurring basis | Operating segments    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale $ 88,550,000,000 $ 85,809,000,000
Trading assets:    
Debt instruments 5,811,000,000 3,395,000,000
Equity instruments 4,539,000,000 1,114,000,000
Effect of master netting agreements (5,819,000,000) (5,939,000,000)
Trading assets 13,571,000,000 7,035,000,000
Other assets 217,000,000 238,000,000
Total assets 102,540,000,000 93,586,000,000
Trading liabilities:    
Total trading liabilities 4,841,000,000 3,479,000,000
Effect of master netting agreements (5,415,000,000) (6,170,000,000)
Long-term debt 387,000,000 371,000,000
Total other liabilities – derivative liabilities designated as hedging 607,000,000  
Total liabilities 5,835,000,000 3,938,000,000
Assets measured at fair value on a recurring basis | Operating segments | Investment management funds    
Trading assets:    
Total assets 245,000,000 463,000,000
Trading liabilities:    
Total liabilities 1,000,000 2,000,000
Assets measured at fair value on a recurring basis | Operating segments | Interest rate contracts    
Trading assets:    
Effect of master netting agreements (1,792,000,000) (2,202,000,000)
Trading liabilities:    
Effect of master netting agreements (1,986,000,000) (2,508,000,000)
Assets measured at fair value on a recurring basis | Operating segments | Foreign exchange contracts    
Trading assets:    
Effect of master netting agreements (4,021,000,000) (3,724,000,000)
Trading liabilities:    
Effect of master netting agreements (3,428,000,000) (3,626,000,000)
Assets measured at fair value on a recurring basis | Operating segments | Equity contracts    
Trading assets:    
Effect of master netting agreements (6,000,000) (13,000,000)
Trading liabilities:    
Effect of master netting agreements (1,000,000) (36,000,000)
Assets measured at fair value on a recurring basis | Operating segments | Agency RMBS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 27,043,000,000 25,308,000,000
Assets 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 15,431,000,000 20,076,000,000
Assets 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 12,646,000,000 10,750,000,000
Assets 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 9,417,000,000 9,691,000,000
Assets 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 4,197,000,000 2,878,000,000
Assets measured at fair value on a recurring basis | Operating segments | CLOs    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 4,063,000,000 3,364,000,000
Assets 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 3,709,000,000 2,984,000,000
Assets 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 2,643,000,000 1,161,000,000
Assets 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 2,178,000,000 1,464,000,000
Assets measured at fair value on a recurring basis | Operating segments | Other ABS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,143,000,000 1,773,000,000
Assets 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 1,949,000,000 1,657,000,000
Assets 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 1,233,000,000 1,325,000,000
Assets 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 1,044,000,000 2,247,000,000
Assets 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 853,000,000 1,054,000,000
Assets 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 1,000,000 77,000,000
Assets measured at fair value on a recurring basis | Operating segments | Not designated as hedging    
Trading assets:    
Total derivative assets 3,221,000,000 2,526,000,000
Trading liabilities:    
Effect of master netting agreements (5,415,000,000)  
Derivative liabilities 3,184,000,000 2,280,000,000
Assets measured at fair value on a recurring basis | Operating segments | Not designated as hedging | Interest rate contracts    
Trading assets:    
Total derivative assets 1,898,000,000 1,388,000,000
Trading liabilities:    
Derivative liabilities 1,264,000,000 608,000,000
Assets measured at fair value on a recurring basis | Operating segments | Not designated as hedging | Foreign exchange contracts    
Trading assets:    
Total derivative assets 1,310,000,000 1,083,000,000
Trading liabilities:    
Derivative liabilities 1,912,000,000 1,589,000,000
Assets measured at fair value on a recurring basis | Operating segments | Not designated as hedging | Equity contracts    
Trading assets:    
Total derivative assets 13,000,000 55,000,000
Trading liabilities:    
Derivative liabilities 8,000,000 83,000,000
Assets measured at fair value on a recurring basis | Operating segments | Designated as hedging    
Trading assets:    
Total derivative assets 21,000,000 289,000,000
Trading liabilities:    
Total other liabilities – derivative liabilities designated as hedging   88,000,000
Assets measured at fair value on a recurring basis | Operating segments | Designated as hedging | Interest rate contracts    
Trading assets:    
Total derivative assets   23,000,000
Trading liabilities:    
Derivative liabilities 350,000,000 74,000,000
Assets measured at fair value on a recurring basis | Operating segments | Designated as hedging | Foreign exchange contracts    
Trading assets:    
Total derivative assets 21,000,000 266,000,000
Trading liabilities:    
Derivative liabilities 257,000,000 14,000,000
Assets measured at fair value on a recurring basis | Operating segments | Debt instruments    
Trading liabilities:    
Total trading liabilities 1,584,000,000 1,124,000,000
Assets measured at fair value on a recurring basis | Operating segments | Equity instruments    
Trading liabilities:    
Total trading liabilities 73,000,000 75,000,000
Assets 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 23,215,000,000 26,689,000,000
Trading assets:    
Debt instruments 1,568,000,000 801,000,000
Equity instruments 4,539,000,000 1,114,000,000
Trading assets 6,111,000,000 1,931,000,000
Other assets 38,000,000 68,000,000
Total assets $ 29,364,000,000 $ 28,688,000,000
Percentage of total assets prior to netting 27.00% 29.00%
Trading liabilities:    
Total trading liabilities $ 1,559,000,000 $ 1,094,000,000
Long-term debt 0 0
Total other liabilities – derivative liabilities designated as hedging 0  
Total liabilities $ 1,559,000,000 $ 1,094,000,000
Percentage of total liabilities prior to netting 14.00% 11.00%
Assets measured at fair value on a recurring basis | Operating segments | Level 1 | Investment management funds    
Trading assets:    
Total assets $ 212,000,000 $ 210,000,000
Trading liabilities:    
Total liabilities 1,000,000 2,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 1 | Agency RMBS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 0 0
Assets 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 15,431,000,000 20,076,000,000
Assets 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 7,784,000,000 6,613,000,000
Assets 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 0 0
Assets 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 0 0
Assets measured at fair value on a recurring basis | Operating segments | Level 1 | CLOs    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets measured at fair value on a recurring basis | Operating segments | Level 1 | Other ABS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets measured at fair value on a recurring basis | Operating segments | Level 1 | Not designated as hedging    
Trading assets:    
Total derivatives fair value 4,000,000 16,000,000
Trading liabilities:    
Total derivatives fair value 9,000,000 13,000,000
Assets 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 4,000,000 7,000,000
Trading liabilities:    
Total derivatives fair value 6,000,000 12,000,000
Assets 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
Assets measured at fair value on a recurring basis | Operating segments | Level 1 | Not designated as hedging | Equity contracts    
Trading assets:    
Total derivatives fair value 0 9,000,000
Trading liabilities:    
Total derivatives fair value 3,000,000 1,000,000
Assets 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 other liabilities – derivative liabilities designated as hedging   0
Assets 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
Assets 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
Assets measured at fair value on a recurring basis | Operating segments | Level 1 | Debt instruments    
Trading liabilities:    
Total trading liabilities 1,477,000,000 1,006,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 1 | Equity instruments    
Trading liabilities:    
Total trading liabilities 73,000,000 75,000,000
Assets 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 65,335,000,000 59,120,000,000
Trading assets:    
Debt instruments 4,243,000,000 2,594,000,000
Equity instruments 0 0
Trading assets 13,279,000,000 11,043,000,000
Other assets 179,000,000 170,000,000
Total assets $ 78,814,000,000 $ 70,622,000,000
Percentage of total assets prior to netting 73.00% 71.00%
Trading liabilities:    
Total trading liabilities $ 8,697,000,000 $ 8,555,000,000
Long-term debt 387,000,000 371,000,000
Total other liabilities – derivative liabilities designated as hedging 607,000,000  
Total liabilities $ 9,691,000,000 $ 9,014,000,000
Percentage of total liabilities prior to netting 86.00% 89.00%
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Investment management funds    
Trading assets:    
Total assets $ 33,000,000 $ 253,000,000
Trading liabilities:    
Total liabilities 0 0
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Agency RMBS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 27,043,000,000 25,308,000,000
Assets 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 0 0
Assets 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 4,862,000,000 4,137,000,000
Assets 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 9,417,000,000 9,691,000,000
Assets 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 4,197,000,000 2,878,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | CLOs    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 4,063,000,000 3,364,000,000
Assets 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 3,709,000,000 2,984,000,000
Assets 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 2,643,000,000 1,161,000,000
Assets 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 2,178,000,000 1,464,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Other ABS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,143,000,000 1,773,000,000
Assets 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 1,949,000,000 1,657,000,000
Assets 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 1,233,000,000 1,325,000,000
Assets 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 1,044,000,000 2,247,000,000
Assets 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 853,000,000 1,054,000,000
Assets 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 1,000,000 77,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Not designated as hedging    
Trading assets:    
Total derivatives fair value 9,036,000,000 8,449,000,000
Trading liabilities:    
Total derivatives fair value 8,590,000,000 8,437,000,000
Assets 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 3,686,000,000 3,583,000,000
Trading liabilities:    
Total derivatives fair value 3,244,000,000 3,104,000,000
Assets 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 5,331,000,000 4,807,000,000
Trading liabilities:    
Total derivatives fair value 5,340,000,000 5,215,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Not designated as hedging | Equity contracts    
Trading assets:    
Total derivatives fair value 19,000,000 59,000,000
Trading liabilities:    
Total derivatives fair value 6,000,000 118,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Designated as hedging    
Trading assets:    
Total derivatives fair value 21,000,000 289,000,000
Trading liabilities:    
Total other liabilities – derivative liabilities designated as hedging   88,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Designated as hedging | Interest rate contracts    
Trading assets:    
Total derivatives fair value   23,000,000
Trading liabilities:    
Total derivatives fair value 350,000,000 74,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Designated as hedging | Foreign exchange contracts    
Trading assets:    
Total derivatives fair value 21,000,000 266,000,000
Trading liabilities:    
Total derivatives fair value 257,000,000 14,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Debt instruments    
Trading liabilities:    
Total trading liabilities 107,000,000 118,000,000
Assets measured at fair value on a recurring basis | Operating segments | Level 2 | Equity instruments    
Trading liabilities:    
Total trading liabilities 0 0
Assets 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 0 0
Trading assets:    
Debt instruments 0 0
Equity instruments 0 0
Trading assets 0 0
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
Long-term debt 0 0
Total other liabilities – derivative liabilities designated as hedging 0  
Total liabilities $ 0 $ 0
Percentage of total liabilities prior to netting 0.00% 0.00%
Assets measured at fair value on a recurring basis | Operating segments | Level 3 | Investment management funds    
Trading assets:    
Total assets $ 0 $ 0
Trading liabilities:    
Total liabilities 0 0
Assets measured at fair value on a recurring basis | Operating segments | Level 3 | Agency RMBS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets measured at fair value on a recurring basis | Operating segments | Level 3 | CLOs    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets measured at fair value on a recurring basis | Operating segments | Level 3 | Other ABS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets 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 0 0
Assets measured at fair value on a recurring basis | Operating segments | Level 3 | Not designated as hedging    
Trading assets:    
Total derivatives fair value 0 0
Total derivative assets 0  
Trading liabilities:    
Total derivatives fair value 0 0
Assets 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
Assets 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
Assets 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
Assets 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 other liabilities – derivative liabilities designated as hedging   0
Assets 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
Assets 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
Assets measured at fair value on a recurring basis | Operating segments | Level 3 | Debt instruments    
Trading liabilities:    
Total trading liabilities 0 0
Assets measured at fair value on a recurring basis | Operating segments | Level 3 | Equity instruments    
Trading liabilities:    
Total trading liabilities 0 0
Assets measured at fair value on a recurring basis | Operating segments | NAV    
Trading assets:    
Assets measured at NAV $ 181,000,000 $ 215,000,000