FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)	Jun. 30, 2018 USD ($) year	Dec. 31, 2017 USD ($) year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	$ 7,788,000,000
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 or purchased under agreements to resell	66,000,000
Mortgage-backed securities	39,000,000
State and municipal, foreign government, corporate and other debt securities	1,103,000,000	949,000,000
Equity securities	87,000,000	55,000,000
Loans and leases	241,000,000	391,000,000
Mortgage servicing rights	87,000,000	87,000,000
Interest-bearing deposits	320,000,000	286,000,000
Federal funds purchased and securities loaned or sold under agreement to repurchase	966,000,000	726,000,000
Securities sold, not yet purchased	165,000,000
Short-term borrowings and long-term debt	13,928,000,000	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 or purchased under agreements to resell		16,000,000
Price-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	156,000,000	214,000,000
State and municipal, foreign government, corporate and other debt securities	895,000,000	914,000,000
Equity securities	206,000,000	65,000,000
Asset-backed securities	2,058,000,000	2,287,000,000
Non-marketable equities	76,000,000	223,000,000
Loans and leases	139,000,000
Securities sold, not yet purchased	23,000,000	21,000,000
Yield analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	110,000,000	184,000,000
Comparable analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	505,000,000	423,000,000
Cash flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	$ 508,000,000	$ 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 or purchased under agreements to resell	0.0206	0.0143
Federal funds purchased and securities loaned or sold under agreement to repurchase	0.0206	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	$ 2.34	$ 0.00
Minimum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.0143	0.0134
Minimum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	0.0393
Loans and leases		0.0300
Interest-bearing deposits	0.0393
Short-term borrowings and long-term debt	0.0326
Minimum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	0.8020
Interest-bearing deposits	0.8020	0.9956
Securities sold, not yet purchased	0.2857
Short-term borrowings and long-term debt	0.6307	0.6974
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 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short-term borrowings and long-term debt	0.0849
Minimum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities | year		2.50
Mortgage servicing rights | year	4.09	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	$ 0.01	$ 2.96
Equity securities, value	0.00	0.00
Asset-backed securities	3.00	4.25
Loans and leases, value	0.76
Securities sold, not yet purchased, value	$ 0.00	$ 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	0.0409	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	0.0035
Minimum | Price-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.0326
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 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.1502
Minimum | Price-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	(0.8106)
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	0.0271	0.0252
Minimum | Comparable analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	7.30	6.90
Minimum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.0434	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 or purchased under agreements to resell	0.0367	0.0216
Federal funds purchased and securities loaned or sold under agreement to repurchase	0.0324	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	$ 129.50	$ 184.04
Maximum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.0143	0.0500
Maximum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	0.1242
Loans and leases		0.6893
Interest-bearing deposits	0.1242
Short-term borrowings and long-term debt	0.7493
Maximum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	1.2454
Interest-bearing deposits	1.2454	0.9995
Securities sold, not yet purchased	4.5429
Short-term borrowings and long-term debt	1.9578	1.6111
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 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short-term borrowings and long-term debt	0.7822
Maximum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities | year		2.50
Mortgage servicing rights | year	7.74	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	$ 109.48	$ 101.00
Equity securities, value	456.89	25,450.00
Asset-backed securities	100.89	100.60
Loans and leases, value	238.35
Securities sold, not yet purchased, value	$ 456.89	$ 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	0.0409	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	0.0500
Maximum | Price-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.7493
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 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.3188
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 | 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	0.0881	0.1406
Maximum | Comparable analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	10.40	12.80
Maximum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.1214	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 or purchased under agreements to resell	0.0351	0.0209
Federal funds purchased and securities loaned or sold under agreement to repurchase	0.0299	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	$ 92.65	$ 91.74
Weighted Average | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.0143	0.0173
Weighted Average | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	0.0920
Loans and leases		0.2252
Interest-bearing deposits	0.0920
Short-term borrowings and long-term debt	0.1205
Weighted Average | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	1.0547
Interest-bearing deposits	1.0547	0.9972
Securities sold, not yet purchased	1.0411
Short-term borrowings and long-term debt	1.0483	1.0070
Weighted Average | Model-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits	0.0785	0.1050
Short-term borrowings and long-term debt	0.1050
Weighted Average | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short-term borrowings and long-term debt	0.5193
Weighted Average | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities | year		2.50
Mortgage servicing rights | year	6.64	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	$ 83.75	$ 56.52
Equity securities, value	41.58	2,526.62
Asset-backed securities	72.24	74.57
Loans and leases, value	41.60
Securities sold, not yet purchased, value	$ 93.88	$ 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	0.0409	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	0.0238	0.0249
Weighted Average | Price-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.1537
Weighted Average | Price-based | Level 3 | Discount to price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.1537	0.1183
Weighted Average | Price-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.1985
Weighted Average | Price-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	0.5540
Weighted Average | Price-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased	(0.3734)
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	0.0456	0.0597
Weighted Average | Comparable analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	8.88	8.66
Weighted Average | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.0833	0.1147
Interest rate contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 4,344,000,000	$ 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 | Inflation volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0021
Interest rate contracts | Minimum | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0010	0.0940
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 | Inflation volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0263
Interest rate contracts | Maximum | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.7822	0.7740
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 | Inflation volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0075
Interest rate contracts | Weighted Average | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5157	0.5886
Foreign exchange contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 889,000,000	$ 940,000,000
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	0.0034	0.0011
Foreign exchange contracts | Minimum | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0240	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)	(0.5100)
Foreign exchange contracts | Minimum | Model-based | Level 3 | FX rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, value	$ 0.00
Foreign exchange contracts | Minimum | Model-based | Level 3 | IR-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4000	(0.0734)
Foreign exchange contracts | Minimum | Model-based | Level 3 | IR basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.0047)
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	0.2568	0.0717
Foreign exchange contracts | Maximum | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1805	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	0.4000
Foreign exchange contracts | Maximum | Model-based | Level 3 | FX rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, value	$ 0.04
Foreign exchange contracts | Maximum | Model-based | Level 3 | IR-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6000	0.6000
Foreign exchange contracts | Maximum | Model-based | Level 3 | IR basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0036
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	0.0300	0.0173
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1079	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	0.3408	0.3656
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | FX rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, value	$ 0.04
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | IR-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5000	0.4904
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | IR basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.0019)
Equity contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 2,038,000,000	$ 2,897,000,000
Equity contracts | Minimum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0326	0.0300
Equity contracts | Minimum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6307	0.6974
Equity contracts | Minimum | Model-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.8106)
Equity contracts | Minimum | Model-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.8300)
Equity contracts | Minimum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets | year	2.00
Equity contracts | Maximum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.7493	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 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.0000
Equity contracts | Maximum | Model-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5400
Equity contracts | Maximum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets | year	4.43
Equity contracts | Weighted Average | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2661	0.2466
Equity contracts | Weighted Average | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.0093	0.9280
Equity contracts | Weighted Average | Model-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5536
Equity contracts | Weighted Average | Model-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.3730)
Equity contracts | Weighted Average | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets | year	2.90
Commodity contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 3,095,000,000	$ 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	0.2857	0.0366
Commodity contracts | Minimum | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0933	0.0860
Commodity contracts | Minimum | Model-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.5224)
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	4.5429	2.9059
Commodity contracts | Maximum | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4605	0.6673
Commodity contracts | Maximum | Model-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9144
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	1.0829	1.1416
Commodity contracts | Weighted Average | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2151	0.2504
Commodity contracts | Weighted Average | Model-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2232
Credit derivatives | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 1,778,000,000	$ 1,797,000,000
Credit derivatives | Price-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 781,000,000	$ 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	$ 10.31	$ 1.00
Credit derivatives | Minimum | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0004	0.0003
Credit derivatives | Minimum | Price-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0167
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	0.8000	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	$ 225.00	$ 100.24
Credit derivatives | Maximum | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1266	0.1636
Credit derivatives | Maximum | Price-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9799
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	0.4267	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	$ 88.72	$ 57.63
Credit derivatives | Weighted Average | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0110	0.0173
Credit derivatives | Weighted Average | Price-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5621
Credit derivatives | Weighted Average | Price-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5048