Derivatives and Hedging Activities - Significant Unobservable Inputs Used to Value Level 3 Derivatives (Detail) $ in Millions	Sep. 30, 2022 USD ($) bps spreads	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($) spreads bps	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities) | $	$ 4,143	$ 3,174	$ 440	$ 649	$ 567	$ 1,175
Interest rates
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities) | $	1,473	1,035	183	247	308	267
Credit
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities) | $	1,666	2,164	1,854	1,719	1,750	1,778
Currencies
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities) | $	125	(239)	(147)	(119)	(234)	(338)
Commodities
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities) | $	1,517	1,435	438	513	266	300
Equities
Fair Value Measurement Inputs Disclosure [Line Items]
Fair value of derivative assets (liabilities) | $	$ (638)	$ (1,221)	$ (1,888)	$ (1,711)	$ (1,523)	$ (832)
Minimum | Interest rates | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	25		25
Minimum | Interest rates | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs | bps	31		31
Minimum | Credit | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs | bps	4		1
Minimum | Credit | Level 3 | Upfront credit points
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	0		2
Minimum | Credit | Level 3 | Recovery rates
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	20		20
Minimum | Currencies | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	20		20
Minimum | Currencies | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	20		19
Minimum | Commodities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	25		15
Minimum | Commodities | Electricity | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	2.60		1.50
Minimum | Commodities | Natural gas | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(3.59)		(1.33)
Minimum | Commodities | Oil | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(5.50)		8.64
Minimum | Equities | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(70)		(70)
Minimum | Equities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	2		3
Maximum | Interest rates | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	81		81
Maximum | Interest rates | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs | bps	100		100
Maximum | Credit | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs | bps	1,040		568
Maximum | Credit | Level 3 | Upfront credit points
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	100		100
Maximum | Credit | Level 3 | Recovery rates
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	50		50
Maximum | Currencies | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	71		71
Maximum | Currencies | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	21		19
Maximum | Commodities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	148		93
Maximum | Commodities | Electricity | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	309.83		289.96
Maximum | Commodities | Natural gas | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	8.59		2.60
Maximum | Commodities | Oil | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	48.91		22.68
Maximum | Equities | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	100		99
Maximum | Equities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	89		150
Average | Interest rates | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	64		63
Average | Interest rates | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs | bps	63		59
Average | Credit | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs | bps	188		136
Average | Credit | Level 3 | Upfront credit points
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	41		34
Average | Credit | Level 3 | Recovery rates
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	41		37
Average | Currencies | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	39		40
Average | Currencies | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	21		19
Average | Commodities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	56		32
Average | Commodities | Electricity | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	54.13		37.42
Average | Commodities | Natural gas | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(0.16)		(0.11)
Average | Commodities | Oil | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	20.75		13.36
Average | Equities | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	64		59
Average | Equities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	16		17
Median | Interest rates | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	63		62
Median | Interest rates | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs | bps	61		54
Median | Credit | Level 3 | Credit spreads (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs | bps	117		107
Median | Credit | Level 3 | Upfront credit points
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	34		26
Median | Credit | Level 3 | Recovery rates
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	40		40
Median | Currencies | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	23		41
Median | Currencies | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	21		19
Median | Commodities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	47		29
Median | Commodities | Electricity | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	48.43		32.20
Median | Commodities | Natural gas | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	(0.20)		(0.07)
Median | Commodities | Oil | Level 3 | Spread
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	20.07		12.69
Median | Equities | Level 3 | Correlation
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	66		62
Median | Equities | Level 3 | Volatility (bps)
Fair Value Measurement Inputs Disclosure [Line Items]
Significant unobservable inputs	13		17