FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)	Mar. 31, 2020 USD ($) year	Dec. 31, 2019 USD ($) year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	$ 1,213,000,000	$ 1,162,000,000
Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	300,000,000	303,000,000
Mortgage-backed securities		22,000,000
State and municipal, foreign government, corporate and other debt securities	672,000,000	880,000,000
Marketable equity securities	50,000,000	30,000,000
Loans and leases	495,000,000	378,000,000
Mortgage servicing rights	77,000,000	77,000,000
Interest-bearing deposits	491,000,000	215,000,000
Securities loaned and sold under agreement to repurchase	730,000,000	757,000,000
Securities sold, not yet purchased	155,000,000
Short-term borrowings and long-term debt	18,260,000,000	17,182,000,000
Price-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	328,000,000	196,000,000
State and municipal, foreign government, corporate and other debt securities	1,334,000,000	677,000,000
Marketable equity securities	93,000,000	70,000,000
Asset-backed securities	958,000,000	812,000,000
Non-marketable equities	88,000,000	97,000,000
Securities sold, not yet purchased	1,165,000,000	46,000,000
Yield analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	115,000,000
Asset-backed securities	610,000,000	368,000,000
Comparable analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	240,000,000	316,000,000
Cash flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	$ 290,000,000	$ 418,000,000
Minimum | Model-based | Level 3 | Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.15%	1.59%
Securities loaned and sold under agreement to repurchase	0.0015	0.0159
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		$ 0
Minimum | Model-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.15%	0.15%
Loans and leases	0.0034	0.0009
Securities sold, not yet purchased	0.0505
Minimum | Model-based | Level 3 | Mean Reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits		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]
Interest-bearing deposits	0.0035
Short-term borrowings and long-term debt	0.0022	0.0009
Minimum | Model-based | Level 3 | Forward Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits		0.9759
Short-term borrowings and long-term debt	0.3394	0.3762
Minimum | Model-based | Level 3 | Equity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.2401	0.3200
Minimum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities | year	1.24	1.48
Derivative assets | year		1.48
Mortgage servicing rights | year	2.94	4.07
Minimum | Model-based | Level 3 | Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	$ 5,450,000,000	$ 5,450,000,000
Minimum | Model-based | Level 3 | Equity-IR Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short-term borrowings and long-term debt		0.1500
Minimum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	43	$ 36
State and municipal, foreign government, corporate and other debt securities	34
Marketable equity securities	0	0
Asset-backed securities	1	4
Non-marketable equities		3
Securities sold, not yet purchased	$ 0	$ 0
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 | Appraised Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	$ 571,000	$ 397,000
Minimum | Price-based | Level 3 | Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	1.80
Minimum | Price-based | Level 3 | Discount to Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0	0
Minimum | Price-based | Level 3 | PE Ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	9.60	14.70
Minimum | Price-based | Level 3 | Price to Book Ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.60	1.50
Minimum | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities		1.30%
Asset-backed securities	3.72%	0.61%
Minimum | Comparable analysis | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	$ 3
Minimum | Comparable analysis | Level 3 | EBITDA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		7.00
Minimum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.0245	0.0178
Maximum | Model-based | Level 3 | Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	1.87%	3.67%
Securities loaned and sold under agreement to repurchase	0.0184	0.0238
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		$ 1,238
Maximum | Model-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.15%	0.15%
Loans and leases	0.0576	0.0052
Securities sold, not yet purchased	0.1100
Maximum | Model-based | Level 3 | Mean Reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits		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]
Interest-bearing deposits	0.0115
Short-term borrowings and long-term debt	0.0115	0.0066
Maximum | Model-based | Level 3 | Forward Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits		1.1106
Short-term borrowings and long-term debt	5.8393	3.6257
Maximum | Model-based | Level 3 | Equity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	1.7787	0.3200
Maximum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities | year	1.24	1.48
Derivative assets | year		1.48
Mortgage servicing rights | year	5.97	8.13
Maximum | Model-based | Level 3 | Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	$ 5,450,000,000	$ 5,450,000,000
Maximum | Model-based | Level 3 | Equity-IR Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short-term borrowings and long-term debt		0.4400
Maximum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	121	$ 505
State and municipal, foreign government, corporate and other debt securities	1,014
Marketable equity securities	28,483	38,500
Asset-backed securities	100	103
Non-marketable equities		2,019
Securities sold, not yet purchased	$ 7,038	$ 866
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	0.0295	0.0295
Maximum | Price-based | Level 3 | Appraised Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	$ 25,002,000	$ 33,246,000
Maximum | Price-based | Level 3 | Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	20.50
Maximum | Price-based | Level 3 | Discount to Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.1000	0.1000
Maximum | Price-based | Level 3 | PE Ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	23.80	28.70
Maximum | Price-based | Level 3 | Price to Book Ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	1.60	3.00
Maximum | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities		12.44%
Asset-backed securities	25.26%	23.38%
Maximum | Comparable analysis | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	$ 1,513
Maximum | Comparable analysis | Level 3 | EBITDA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		17.95
Maximum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.1200	0.1200
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	1.51%	2.72%
Securities loaned and sold under agreement to repurchase	0.0101	0.0195
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		$ 90
Weighted Average | Model-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.15%	0.15%
Loans and leases	0.0189	0.0048
Securities sold, not yet purchased	0.0747
Weighted Average | Model-based | Level 3 | Mean Reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits		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]
Interest-bearing deposits	0.0059
Short-term borrowings and long-term debt	0.0056	0.0046
Weighted Average | Model-based | Level 3 | Forward Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest-bearing deposits		1.0296
Short-term borrowings and long-term debt	0.9299	0.9752
Weighted Average | Model-based | Level 3 | Equity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.6618	0.3200
Weighted Average | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities | year	1.24	1.48
Derivative assets | year		1.48
Mortgage servicing rights | year	4.6	6.61
Weighted Average | Model-based | Level 3 | Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	$ 5,450,000,000	$ 5,450,000,000
Weighted Average | Model-based | Level 3 | Equity-IR Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short-term borrowings and long-term debt		0.3266
Weighted Average | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	90	$ 97
State and municipal, foreign government, corporate and other debt securities	88
Marketable equity securities	1,051	2,979
Asset-backed securities	52	60
Non-marketable equities		1,020
Securities sold, not yet purchased	$ 107	$ 96
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	0.0210	0.0209
Weighted Average | Price-based | Level 3 | Appraised Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	$ 10,799,000	$ 8,446,000
Weighted Average | Price-based | Level 3 | Revenue Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	5.34
Weighted Average | Price-based | Level 3 | Discount to Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.5700	0.0232
Weighted Average | Price-based | Level 3 | PE Ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	15.48	20.54
Weighted Average | Price-based | Level 3 | Price to Book Ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.96	1.88
Weighted Average | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities		4.81%
Asset-backed securities	11.37%	8.88%
Weighted Average | Comparable analysis | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	$ 805
Weighted Average | Comparable analysis | Level 3 | EBITDA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		10.34
Weighted Average | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.0656	0.0949
Interest rate contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 5,028,000,000	$ 2,196,000,000
Interest rate contracts | Minimum | Model-based | Level 3 | Mean Reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0100
Interest rate contracts | Minimum | Model-based | Level 3 | Inflation Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0022	0.0021
Interest rate contracts | Minimum | Model-based | Level 3 | IR Normal Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0025	0.0009
Interest rate contracts | Maximum | Model-based | Level 3 | Mean Reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.2000
Interest rate contracts | Maximum | Model-based | Level 3 | Inflation Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0293	0.0274
Interest rate contracts | Maximum | Model-based | Level 3 | IR Normal Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0115	0.0066
Interest rate contracts | Weighted Average | Model-based | Level 3 | Mean Reversion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.1050
Interest rate contracts | Weighted Average | Model-based | Level 3 | Inflation Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0081	0.0079
Interest rate contracts | Weighted Average | Model-based | Level 3 | IR Normal Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0058	0.0053
Foreign exchange contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 1,438,000,000	$ 1,099,000,000
Foreign exchange contracts | Minimum | Model-based | Level 3 | Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0078	0.0272
Foreign exchange contracts | Minimum | Model-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0060
Foreign exchange contracts | Minimum | Model-based | Level 3 | IR Normal Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0022	0.0027
Foreign exchange contracts | Minimum | Model-based | Level 3 | FX Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.3739
Foreign exchange contracts | Minimum | Model-based | Level 3 | FX Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0785	0.0127
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 | IR-FX Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4000	0.4000
Foreign exchange contracts | Maximum | Model-based | Level 3 | Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5826	0.5614
Foreign exchange contracts | Maximum | Model-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0661
Foreign exchange contracts | Maximum | Model-based | Level 3 | IR Normal Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0115	0.0066
Foreign exchange contracts | Maximum | Model-based | Level 3 | FX Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		5.8684
Foreign exchange contracts | Maximum | Model-based | Level 3 | FX Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2791	0.1216
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 | IR-FX Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6000	0.6000
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1377	0.1311
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0283
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | IR Normal Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0060	0.0058
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | FX Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.8064
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | FX Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1262	0.0917
Foreign exchange contracts | Weighted Average | Model-based | Level 3 | IR-IR Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.3265	0.3200
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	0.5000
Equity contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 3,011,000,000	$ 2,076,000,000
Equity contracts | Minimum | Model-based | Level 3 | Forward Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6152	0.6260
Equity contracts | Minimum | Model-based | Level 3 | Equity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0489	0.0316
Equity contracts | Minimum | Model-based | Level 3 | Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		5,450,000,000
Equity contracts | Maximum | Model-based | Level 3 | Forward Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.0702	1.1269
Equity contracts | Maximum | Model-based | Level 3 | Equity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6194	0.5280
Equity contracts | Maximum | Model-based | Level 3 | Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		5,450,000,000
Equity contracts | Weighted Average | Model-based | Level 3 | Forward Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9293	0.9846
Equity contracts | Weighted Average | Model-based | Level 3 | Equity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2854	0.2843
Equity contracts | Weighted Average | Model-based | Level 3 | Recovery
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		5,450,000,000
Commodity contracts | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 3,015,000,000	$ 1,487,000,000
Commodity contracts | Minimum | Model-based | Level 3 | Forward Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.3394	0.3762
Commodity contracts | Minimum | Model-based | Level 3 | Commodity Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.4142)	(0.3965)
Commodity contracts | Minimum | Model-based | Level 3 | Commodity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0065	0.0525
Commodity contracts | Maximum | Model-based | Level 3 | Forward Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	5.8393	3.6257
Commodity contracts | Maximum | Model-based | Level 3 | Commodity Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9086	0.8781
Commodity contracts | Maximum | Model-based | Level 3 | Commodity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.3896	0.9363
Commodity contracts | Weighted Average | Model-based | Level 3 | Forward Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.1644	1.1932
Commodity contracts | Weighted Average | Model-based | Level 3 | Commodity Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5561	0.4180
Commodity contracts | Weighted Average | Model-based | Level 3 | Commodity Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2938	0.2355
Credit derivatives | Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 1,985,000,000	$ 613,000,000
Credit derivatives | Price-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 417,000,000	$ 341,000,000
Credit derivatives | Minimum | Model-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0008
Credit derivatives | Minimum | Model-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 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		$ 12
Credit derivatives | Minimum | Price-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 0.00
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	0.0250	0.0259
Credit derivatives | Minimum | Price-based | Level 3 | Recovery Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0100	0.2000
Credit derivatives | Maximum | Model-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0283
Credit derivatives | Maximum | Model-based | Level 3 | Credit Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9000
Credit derivatives | Maximum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		$ 100
Credit derivatives | Maximum | Price-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 0.07
Credit derivatives | Maximum | Price-based | Level 3 | Credit Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.8700
Credit derivatives | Maximum | Price-based | Level 3 | Upfront Points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.0863	0.9994
Credit derivatives | Maximum | Price-based | Level 3 | Recovery Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6500	0.6500
Credit derivatives | Weighted Average | Model-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.008
Credit derivatives | Weighted Average | Model-based | Level 3 | Credit Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4494
Credit derivatives | Weighted Average | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		$ 87
Credit derivatives | Weighted Average | Price-based | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 0.02
Credit derivatives | Weighted Average | Price-based | Level 3 | Credit Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.4857
Credit derivatives | Weighted Average | Price-based | Level 3 | Upfront Points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6528	0.5941
Credit derivatives | Weighted Average | Price-based | Level 3 | Recovery Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.3693	0.4800