FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)	Sep. 30, 2018 USD ($) year	Dec. 31, 2017 USD ($) year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	$ 7,482,000,000
Loans and leases		$ 148,000,000
Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Federal funds sold and securities borrowed and purchased under agreements to resell	65,000,000
State and municipal, foreign government, corporate and other debt securities	926,000,000	949,000,000
Equity securities	46,000,000	55,000,000
Loans and leases	318,000,000	391,000,000
Mortgage servicing rights	87,000,000	87,000,000
Interest-bearing deposits	303,000,000	286,000,000
Federal funds purchased and securities loaned and sold under agreement to repurchase	997,000,000	726,000,000
Securities sold, not yet purchased	360,000,000
Short-term borrowings and long-term debt	12,944,000,000	13,100,000,000
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		24,000,000
Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Federal funds sold and securities borrowed and purchased under agreements to resell		16,000,000
Price-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	273,000,000	214,000,000
State and municipal, foreign government, corporate and other debt securities	930,000,000	914,000,000
Equity securities	124,000,000	65,000,000
Asset-backed securities	1,666,000,000	2,287,000,000
Non-marketable equities	282,000,000	223,000,000
Loans and leases	66,000,000
Securities sold, not yet purchased		21,000,000
Yield analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	137,000,000	184,000,000
Comparable analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	428,000,000	423,000,000
Cash flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	$ 531,000,000	$ 471,000,000
Minimum | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.0038
Minimum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Federal funds sold and securities borrowed and purchased under agreements to resell	0.0227	0.0143
Federal funds purchased and securities loaned and sold under agreement to repurchase	0.0227	0.0143
Minimum | Model-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities, value		$ 0.00
Minimum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities	0.0035
Loans and leases	0.0128	0.0134
Minimum | Model-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits	0.0000	0.0100
Short-term borrowings and long-term debt	0.0100
Minimum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.0300
Interest-bearing deposits	0.0734
Short-term borrowings and long-term debt	0.0300
Minimum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits	0.9923	0.9956
Securities sold, not yet purchased	0.4519
Short-term borrowings and long-term debt	0.6599	0.6974
Minimum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities | year	1.73	2.50
Mortgage servicing rights | year	4.11	3.83
Minimum | Model-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.6100
Minimum | Model-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.2500
Minimum | Model-based | Level 3 | Redemption rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.1072
Minimum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities, value	$ 37.40	$ 2.96
State and municipal, foreign government, corporate and other debt securities, value	0.00
Equity securities, value	0.00	0.00
Asset-backed securities	$ 3.56	4.25
Securities sold, not yet purchased, value		$ 1.00
Minimum | Price-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities		0.0236
Loans and leases	0.0415	0.0309
Minimum | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities		0.0035
Minimum | Price-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	(0.8139)
Minimum | Price-based | Level 3 | Discount to price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.0000	0.0000
Minimum | Price-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.0100
Minimum | Price-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.0300
Minimum | Price-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	(0.8274)
Minimum | Price-based | Level 3 | Price-to-book ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		0.05
Minimum | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	0.0313	0.0252
Minimum | Comparable analysis | Level 3 | Net operating income multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities, value	$ 7.30
Minimum | Comparable analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		6.90
Minimum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.0479	0.0800
Maximum | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.0275
Maximum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Federal funds sold and securities borrowed and purchased under agreements to resell	0.0367	0.0216
Federal funds purchased and securities loaned and sold under agreement to repurchase	0.0341	0.0216
Maximum | Model-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities, value		$ 184.04
Maximum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities	0.0446
Loans and leases	0.0215	0.0500
Maximum | Model-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits	0.2000	0.2000
Short-term borrowings and long-term debt	0.2000
Maximum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.6893
Interest-bearing deposits	0.2078
Short-term borrowings and long-term debt	0.8372
Maximum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits	1.0669	0.9995
Securities sold, not yet purchased	5.4900
Short-term borrowings and long-term debt	2.5953	1.6111
Maximum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities | year	1.73	2.50
Mortgage servicing rights | year	8.10	6.89
Maximum | Model-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.6100
Maximum | Model-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.4000
Maximum | Model-based | Level 3 | Redemption rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.9950
Maximum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities, value	$ 108.00	$ 101.00
State and municipal, foreign government, corporate and other debt securities, value	108.15
Equity securities, value	865.86	25,450.00
Asset-backed securities	$ 100.91	100.60
Securities sold, not yet purchased, value		$ 287.64
Maximum | Price-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities		0.1425
Loans and leases	0.0415	0.0440
Maximum | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities		0.0500
Maximum | Price-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	1.0000
Maximum | Price-based | Level 3 | Discount to price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	1.0000	1.0000
Maximum | Price-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.2000
Maximum | Price-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.8372
Maximum | Price-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.5400
Maximum | Price-based | Level 3 | Price-to-book ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		1.00
Maximum | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	0.1429	0.1406
Maximum | Comparable analysis | Level 3 | Net operating income multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities, value	$ 25.00
Maximum | Comparable analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		12.80
Maximum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.1200	0.1638
Weighted Average | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.0127
Weighted Average | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Federal funds sold and securities borrowed and purchased under agreements to resell	0.0354	0.0209
Federal funds purchased and securities loaned and sold under agreement to repurchase	0.0314	0.0209
Weighted Average | Model-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities, value		$ 91.74
Weighted Average | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities	0.0246
Loans and leases	0.0161	0.0173
Weighted Average | Model-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits	0.0795	0.1050
Short-term borrowings and long-term debt	0.1050
Weighted Average | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.2252
Interest-bearing deposits	0.1798
Short-term borrowings and long-term debt	0.1928
Weighted Average | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits	1.0180	0.9972
Securities sold, not yet purchased	1.0021
Short-term borrowings and long-term debt	1.0359	1.0070
Weighted Average | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities | year	1.73	2.50
Mortgage servicing rights | year	6.92	5.93
Weighted Average | Model-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.6100
Weighted Average | Model-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.3156
Weighted Average | Model-based | Level 3 | Redemption rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)(6)		0.7424
Weighted Average | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities, value	$ 92.56	$ 56.52
State and municipal, foreign government, corporate and other debt securities, value	79.65
Equity securities, value	3.50	2,526.62
Asset-backed securities	$ 69.41	74.57
Securities sold, not yet purchased, value		$ 88.19
Weighted Average | Price-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities		0.0603
Loans and leases	0.0415	0.0313
Weighted Average | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities		0.0249
Weighted Average | Price-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.4102
Weighted Average | Price-based | Level 3 | Discount to price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.0062	0.1183
Weighted Average | Price-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.1050
Weighted Average | Price-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.2217
Weighted Average | Price-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	(0.3258)
Weighted Average | Price-based | Level 3 | Price-to-book ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		0.32
Weighted Average | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	0.0472	0.0597
Weighted Average | Comparable analysis | Level 3 | Net operating income multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities, value	$ 10.49
Weighted Average | Comparable analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		8.66
Weighted Average | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.0831	0.1147
Interest rate contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 4,470,000,000	$ 3,818,000,000
Interest rate contracts | Minimum | Model-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0100	0.0100
Interest rate contracts | Minimum | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0014	0.0940
Interest rate contracts | Minimum | Model-based | Level 3 | Inflation volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0020
Interest rate contracts | Maximum | Model-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2000	0.2000
Interest rate contracts | Maximum | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.7879	0.7740
Interest rate contracts | Maximum | Model-based | Level 3 | Inflation volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0256
Interest rate contracts | Weighted Average | Model-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1050	0.1050
Interest rate contracts | Weighted Average | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5337	0.5886
Interest rate contracts | Weighted Average | Model-based | Level 3 | Inflation volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0076
Foreign exchange contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 749,000,000	$ 940,000,000
Foreign exchange contracts | Cash flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 82,000,000
Foreign exchange contracts | Minimum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(0.0055)
Foreign exchange contracts | Minimum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0011
Foreign exchange contracts | Minimum | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0315	0.0458
Foreign exchange contracts | Minimum | Model-based | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(0.5100)
Foreign exchange contracts | Minimum | Model-based | Level 3 | IR-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(0.0734)
Foreign exchange contracts | Minimum | Cash flow | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0039
Foreign exchange contracts | Minimum | Cash flow | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, value	$ (0.5100)
Foreign exchange contracts | Minimum | Cash flow | Level 3 | IR-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4000
Foreign exchange contracts | Minimum | Cash flow | Level 3 | FX rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0000
Foreign exchange contracts | Minimum | Cash flow | Level 3 | IR basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.0079)
Foreign exchange contracts | Maximum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0028
Foreign exchange contracts | Maximum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0717
Foreign exchange contracts | Maximum | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1735	0.1502
Foreign exchange contracts | Maximum | Model-based | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.4000
Foreign exchange contracts | Maximum | Model-based | Level 3 | IR-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.6000
Foreign exchange contracts | Maximum | Cash flow | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0880
Foreign exchange contracts | Maximum | Cash flow | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, value	$ 0.4000
Foreign exchange contracts | Maximum | Cash flow | Level 3 | IR-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6000
Foreign exchange contracts | Maximum | Cash flow | Level 3 | FX rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0004
Foreign exchange contracts | Maximum | Cash flow | Level 3 | IR basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0900
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0004
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0173
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1096	0.0816
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.3656
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | IR-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.4904
Foreign exchange contracts | Weighted Average | Cash flow | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0379
Foreign exchange contracts | Weighted Average | Cash flow | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, value	$ 0.3360
Foreign exchange contracts | Weighted Average | Cash flow | Level 3 | IR-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5000
Foreign exchange contracts | Weighted Average | Cash flow | Level 3 | FX rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0003
Foreign exchange contracts | Weighted Average | Cash flow | Level 3 | IR basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0067
Equity contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 1,478,000,000	$ 2,897,000,000
Equity contracts | Minimum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0300	0.0300
Equity contracts | Minimum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6310	0.6974
Equity contracts | Minimum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.73
Equity contracts | Maximum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.8372	0.6893
Equity contracts | Maximum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.5910	1.5419
Equity contracts | Maximum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.73
Equity contracts | Weighted Average | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2896	0.2466
Equity contracts | Weighted Average | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9777	0.9280
Equity contracts | Weighted Average | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.73
Commodity contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 3,049,000,000	$ 2,937,000,000
Commodity contracts | Minimum | Level 3 | Commodity Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(0.3764)
Commodity contracts | Minimum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4519	0.0366
Commodity contracts | Minimum | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0760	0.0860
Commodity contracts | Minimum | Model-based | Level 3 | Commodity Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.5245)
Commodity contracts | Maximum | Level 3 | Commodity Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.9171
Commodity contracts | Maximum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	5.4900	2.9059
Commodity contracts | Maximum | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5500	0.6673
Commodity contracts | Maximum | Model-based | Level 3 | Commodity Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9137
Commodity contracts | Weighted Average | Level 3 | Commodity Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.1521
Commodity contracts | Weighted Average | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.2977	1.1416
Commodity contracts | Weighted Average | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1732	0.2504
Commodity contracts | Weighted Average | Model-based | Level 3 | Commodity Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1771
Credit derivatives | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 1,924,000,000	$ 1,797,000,000
Credit derivatives | Price-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 714,000,000	$ 823,000,000
Credit derivatives | Minimum | Model-based | Level 3 | Credit correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2500	0.2500
Credit derivatives | Minimum | Model-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0603
Credit derivatives | Minimum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, value	$ 31.77	$ 1.00
Credit derivatives | Minimum | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0002	0.0003
Credit derivatives | Minimum | Price-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0513
Credit derivatives | Minimum | Price-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0500
Credit derivatives | Maximum | Model-based | Level 3 | Credit correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.8500	0.9000
Credit derivatives | Maximum | Model-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.9726
Credit derivatives | Maximum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, value	$ 98.00	$ 100.24
Credit derivatives | Maximum | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1260	0.1636
Credit derivatives | Maximum | Price-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9798
Credit derivatives | Maximum | Price-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6500
Credit derivatives | Weighted Average | Model-based | Level 3 | Credit correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4350	0.4464
Credit derivatives | Weighted Average | Model-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.6288
Credit derivatives | Weighted Average | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, value	$ 79.28	$ 57.63
Credit derivatives | Weighted Average | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0084	0.0173
Credit derivatives | Weighted Average | Price-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5349
Credit derivatives | Weighted Average | Price-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4809