FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)	Jun. 30, 2019 USD ($) year	Dec. 31, 2018 USD ($) year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	$ 1,273,000,000	$ 1,109,000,000
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	122,000,000	115,000,000
State and municipal, foreign government, corporate and other debt securities	1,093,000,000	938,000,000
Marketable equity securities	41,000,000	45,000,000
Loans and leases	379,000,000	248,000,000
Mortgage servicing rights	83,000,000	84,000,000
Interest-bearing deposits	1,182,000,000	495,000,000
Securities loaned and sold under agreement to repurchase	1,085,000,000	983,000,000
Securities sold, not yet purchased		509,000,000
Short-term borrowings and long-term debt	15,232,000,000	12,289,000,000
Price-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities	1,261,000,000	1,212,000,000
Marketable equity securities	81,000,000	108,000,000
Asset-backed securities	1,429,000,000	1,608,000,000
Non-marketable equities	152,000,000	255,000,000
Loans and leases		29,000,000
Mortgage-backed securities	162,000,000	313,000,000
Securities sold, not yet purchased	27,000,000	77,000,000
Yield analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	220,000,000	198,000,000
Comparable analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	262,000,000	293,000,000
Cash flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	$ 424,000,000	$ 500,000,000
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	0.0035
Loans and leases	0.0110	0.0138
Minimum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.0177	0.0252
Securities loaned and sold under agreement to repurchase	0.0177	0.0252
Minimum | Model-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0
Minimum | Model-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits	0.0100	0.0100
Short-term borrowings and long-term debt	0.0100	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	0.0015	0.0016
Minimum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.27
Interest-bearing deposits		0.0300
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		0.6466
Securities sold, not yet purchased		0.1530
Short-term borrowings and long-term debt	0.2615	0.6466
Minimum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities | year	1	1.47
Mortgage servicing rights | year	3.4	3.55
Minimum | Price-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.0030
Minimum | Price-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	$ 0
Marketable equity securities, value	0.01	0
Asset-backed securities	$ 2.75	2.75
Non-marketable equities	8.18
Non-marketable equities		2.38
Loans and leases		55.83
Mortgage-backed securities	$ 15.00	$ 11.25
Securities sold, not yet purchased	0
Minimum | Price-based | Level 3 | Appraised value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	381,810
Minimum | Price-based | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	3.15	2.25
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 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	$ 0
Minimum | Price-based | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		5.00
Minimum | Price-based | Level 3 | Net operating income multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		24.70
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 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.0892
Minimum | Price-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		(0.5190)
Minimum | Price-based | Level 3 | Equity-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		(0.4000)
Minimum | Price-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		(0.8627)
Minimum | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	0.0194	0.0227
Minimum | Comparable analysis | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		0
Minimum | Comparable analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	8.10
Minimum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.0477	0.0460
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	0.0470	0.0446
Loans and leases	0.0110	0.0255
Maximum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.0367	0.0743
Securities loaned and sold under agreement to repurchase	0.0253	0.0321
Maximum | Model-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0
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	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	0.8037	0.8631
Maximum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.37
Interest-bearing deposits		0.7839
Short-term borrowings and long-term debt		0.7839
Maximum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits		1.4445
Securities sold, not yet purchased		5.8507
Short-term borrowings and long-term debt	3.4340	1.4445
Maximum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities | year	1	1.47
Mortgage servicing rights | year	7.1	7.45
Maximum | Price-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.0047
Maximum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities, value	$ 1,127.39	$ 103.75
Marketable equity securities, value	41,284.00	20,255.00
Asset-backed securities	$ 100.00	101.03
Non-marketable equities	1,540.00
Non-marketable equities		1,073.80
Loans and leases		110.00
Mortgage-backed securities	$ 125.81	$ 110.35
Securities sold, not yet purchased	2,164.17
Maximum | Price-based | Level 3 | Appraised value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	33,710,000
Maximum | Price-based | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	26.12	16.50
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 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	$ 0.1000
Maximum | Price-based | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		34.00
Maximum | Price-based | Level 3 | Net operating income multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		24.70
Maximum | Price-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.7839
Maximum | Price-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.5986
Maximum | Price-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.9211
Maximum | Price-based | Level 3 | Equity-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.7037
Maximum | Price-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.7000
Maximum | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	0.0772	0.0870
Maximum | Comparable analysis | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		1.0000
Maximum | Comparable analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	19.40
Maximum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.1626	0.1200
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	0.0241	0.0238
Loans and leases	0.0110	0.0147
Weighted Average | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.0290	0.0508
Securities loaned and sold under agreement to repurchase	0.0201	0.0287
Weighted Average | Model-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0
Weighted Average | Model-based | Level 3 | Mean reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits	0.1050	0.1050
Short-term borrowings and long-term debt	0.1050	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	0.4402	0.5661
Weighted Average | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.32
Interest-bearing deposits		0.4349
Short-term borrowings and long-term debt		0.4324
Weighted Average | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits		0.9855
Securities sold, not yet purchased		1.0569
Short-term borrowings and long-term debt	1.1853	0.9858
Weighted Average | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities | year	1	1.47
Mortgage servicing rights | year	5.8	6.39
Weighted Average | Price-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.0032
Weighted Average | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
State and municipal, foreign government, corporate and other debt securities, value	$ 77.56	$ 91.39
Marketable equity securities, value	5,730.26	1,247.85
Asset-backed securities	$ 78.27	66.18
Non-marketable equities	773.53
Non-marketable equities		420.24
Loans and leases		92.40
Mortgage-backed securities	$ 86.87	$ 90.07
Securities sold, not yet purchased	86.14
Weighted Average | Price-based | Level 3 | Appraised value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	14,639,552
Weighted Average | Price-based | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	11.76	7.06
Weighted Average | Price-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.3404
Weighted Average | Price-based | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	$ 0.0230
Weighted Average | Price-based | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		9.73
Weighted Average | Price-based | Level 3 | Net operating income multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		24.70
Weighted Average | Price-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.4349
Weighted Average | Price-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.2034
Weighted Average | Price-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.4071
Weighted Average | Price-based | Level 3 | Equity-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		0.3080
Weighted Average | Price-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities sold, not yet purchased		(0.0120)
Weighted Average | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	0.0323	0.0374
Weighted Average | Comparable analysis | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		0.0066
Weighted Average | Comparable analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	11.72
Weighted Average | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.0800	0.0779
Interest rate contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 3,307,000,000	$ 3,467,000,000
Interest rate contracts | Minimum | Model-based | Level 3 | Inflation volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0022	0.0022
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	0.0015	0.0016
Interest rate contracts | Maximum | Model-based | Level 3 | Inflation volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0267	0.0265
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	0.8037	0.8631
Interest rate contracts | Weighted Average | Model-based | Level 3 | Inflation volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0079	0.0077
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	0.4953	0.5624
Foreign exchange contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 796,000,000	$ 626,000,000
Foreign exchange contracts | Cash flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		$ 73,000,000
Foreign exchange contracts | Minimum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0032
Foreign exchange contracts | Minimum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0450
Foreign exchange contracts | Minimum | Model-based | Level 3 | IR Normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0
Foreign exchange contracts | Minimum | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0309	0.0315
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	0.4000
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 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0698
Foreign exchange contracts | Minimum | Cash flow | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(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 | IR basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(0.0065)
Foreign exchange contracts | Maximum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0535
Foreign exchange contracts | Maximum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1133
Foreign exchange contracts | Maximum | Model-based | Level 3 | IR Normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.80
Foreign exchange contracts | Maximum | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1504	0.1735
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		0.0676
Foreign exchange contracts | Maximum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0748
Foreign exchange contracts | Maximum | Cash flow | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		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 | IR basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0011
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0381
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0924
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | IR Normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.24
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0983	0.1137
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.3310
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
Foreign exchange contracts | Weighted Average | Cash flow | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0087
Foreign exchange contracts | Weighted Average | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0723
Foreign exchange contracts | Weighted Average | Cash flow | Level 3 | IR-IR correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.3269
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 | IR basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(0.0017)
Equity contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 2,130,000,000	$ 1,467,000,000
Equity contracts | Minimum | Model-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.4861)	(0.8139)
Equity contracts | Minimum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0287	0.0300
Equity contracts | Minimum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5957	0.6466
Equity contracts | Minimum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		1.47
Equity contracts | Minimum | Model-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.7500)	(0.8627)
Equity contracts | Maximum | Model-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9811	1.0000
Equity contracts | Maximum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.8826	0.7839
Equity contracts | Maximum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.2982	1.4445
Equity contracts | Maximum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		1.47
Equity contracts | Maximum | Model-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.3727	0.7000
Equity contracts | Weighted Average | Model-based | Level 3 | Equity-equity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.7294	0.3549
Equity contracts | Weighted Average | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4813	0.3753
Equity contracts | Weighted Average | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.1902	0.9855
Equity contracts | Weighted Average | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		1.47
Equity contracts | Weighted Average | Model-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.2058)	(0.0120)
Commodity contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 1,900,000,000	$ 1,552,000,000
Commodity contracts | Minimum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2615	0.1530
Commodity contracts | Minimum | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1008	0.0892
Commodity contracts | Minimum | Model-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.4055)	(0.5190)
Commodity contracts | Maximum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	3.4340	5.8507
Commodity contracts | Maximum | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9316	0.5986
Commodity contracts | Maximum | Model-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.8950	0.9211
Commodity contracts | Weighted Average | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.1196	1.4508
Commodity contracts | Weighted Average | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2497	0.2034
Commodity contracts | Weighted Average | Model-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4581	0.4071
Credit derivatives | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 708,000,000	$ 1,089,000,000
Credit derivatives | Price-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 597,000,000	$ 701,000,000
Credit derivatives | Minimum | Model-based | Level 3 | Credit correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0500
Credit derivatives | Minimum | Model-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0499
Credit derivatives | Minimum | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0004
Credit derivatives | Minimum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 12.00	$ 16.59
Credit derivatives | Minimum | Price-based | Level 3 | Credit correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2500
Credit derivatives | Minimum | Price-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0741
Credit derivatives | Minimum | Price-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2000	0.0500
Credit derivatives | Minimum | Cash flow | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0002
Credit derivatives | Maximum | Model-based | Level 3 | Credit correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.8500
Credit derivatives | Maximum | Model-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9977
Credit derivatives | Maximum | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0334
Credit derivatives | Maximum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 98.00	$ 98.00
Credit derivatives | Maximum | Price-based | Level 3 | Credit correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.8500
Credit derivatives | Maximum | Price-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.9904
Credit derivatives | Maximum | Price-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6000	0.6500
Credit derivatives | Maximum | Cash flow | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.1127
Credit derivatives | Weighted Average | Model-based | Level 3 | Credit correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.4106
Credit derivatives | Weighted Average | Model-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5834
Credit derivatives | Weighted Average | Price-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0070
Credit derivatives | Weighted Average | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 69.20	$ 81.19
Credit derivatives | Weighted Average | Price-based | Level 3 | Credit correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4366
Credit derivatives | Weighted Average | Price-based | Level 3 | Upfront points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.5895
Credit derivatives | Weighted Average | Price-based | Level 3 | Recovery rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4100	0.4640
Credit derivatives | Weighted Average | Cash flow | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0087