Fair Value Hierarchy - Significant Unobservable Inputs Used to Value Level 3 Derivatives (Detail)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities)	$ 359,000,000	$ 609,000,000	$ 1,521,000,000	$ 4,143,000,000	$ 3,174,000,000	$ 440,000,000
Interest rates
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities)	(607,000,000)	(589,000,000)	(459,000,000)	1,473,000,000	1,035,000,000	183,000,000
Credit
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities)	1,610,000,000	1,711,000,000	1,460,000,000	1,666,000,000	2,164,000,000	1,854,000,000
Currencies
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities)	148,000,000	129,000,000	162,000,000	125,000,000	(239,000,000)	(147,000,000)
Commodities
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities)	590,000,000	666,000,000	919,000,000	1,517,000,000	1,435,000,000	438,000,000
Equities
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities)	$ (1,382,000,000)	$ (1,308,000,000)	$ (561,000,000)	$ (638,000,000)	$ (1,221,000,000)	$ (1,888,000,000)
Minimum | Interest rates | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(0.10)		(0.10)
Minimum | Interest rates | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.31		0.31
Minimum | Credit | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	8		5
Minimum | Credit | Level 3 | Upfront credit points
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(0.02)		(0.01)
Minimum | Credit | Level 3 | Recovery rates
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.20		0.20
Minimum | Currencies | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.20		0.20
Minimum | Currencies | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.16		0.20
Minimum | Commodities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.29		0.20
Minimum | Commodities | Electricity | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	3.10		3.00
Minimum | Commodities | Natural gas | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(1.53)		(3.21)
Minimum | Commodities | Oil | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(5.03)		12.68
Minimum | Equities | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(0.70)		(0.75)
Minimum | Equities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.02		0.02
Maximum | Interest rates | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.81		0.81
Maximum | Interest rates | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	1.01		1.01
Maximum | Credit | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	1,966		935
Maximum | Credit | Level 3 | Upfront credit points
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	1		1
Maximum | Credit | Level 3 | Recovery rates
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.70		0.50
Maximum | Currencies | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.71		0.71
Maximum | Currencies | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.16		0.21
Maximum | Commodities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.97		1.18
Maximum | Commodities | Electricity | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	330.34		329.28
Maximum | Commodities | Natural gas | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	8.08		5.85
Maximum | Commodities | Oil | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	35.79		48.92
Maximum | Equities | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	1		1
Maximum | Equities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	1.23		0.74
Average | Interest rates | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.61		0.61
Average | Interest rates | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.56		0.60
Average | Credit | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	167		149
Average | Credit | Level 3 | Upfront credit points
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.24		0.29
Average | Credit | Level 3 | Recovery rates
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.42		0.40
Average | Currencies | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.40		0.40
Average | Currencies | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.16		0.20
Average | Commodities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.44		0.50
Average | Commodities | Electricity | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	46.58		47.19
Average | Commodities | Natural gas | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(0.16)		(0.20)
Average | Commodities | Oil | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	12.59		20.42
Average | Equities | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.64		0.66
Average | Equities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.15		0.13
Median | Interest rates | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.78		0.60
Median | Interest rates | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.49		0.57
Median | Credit | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	105		116
Median | Credit | Level 3 | Upfront credit points
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.11		0.18
Median | Credit | Level 3 | Recovery rates
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.40		0.40
Median | Currencies | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.23		0.23
Median | Currencies | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.16		0.20
Median | Commodities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.40		0.46
Median | Commodities | Electricity | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	34.95		39.69
Median | Commodities | Natural gas | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(0.24)		(0.27)
Median | Commodities | Oil | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	12.64		20.36
Median | Equities | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.73		0.75
Median | Equities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0.12		0.07