ACCUMULATED OTHER COMPREHENSIVE INCOME - Summary of Changes in AOCI by Component (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Gains (losses)
Balance, beginning of period (in usd)	$ 9,119	$ 8,490	$ 9,121	$ 8,726
Other comprehensive income (loss) before reclassifications			(398)	(111)
Amounts reclassified from AOCI			11	49
Net other comprehensive income (loss)	(380)	104	(387)	(62)
Balance, end of period (in usd)	8,903	8,535	8,903	8,535
CTA
Gains (losses)
Balance, beginning of period (in usd)			(2,907)	(2,587)
Other comprehensive income (loss) before reclassifications			(432)	(120)
Amounts reclassified from AOCI			0	0
Net other comprehensive income (loss)			(432)	(120)
Balance, end of period (in usd)	(3,339)	(2,707)	(3,339)	(2,707)
Pension and OPEB plans
Gains (losses)
Balance, beginning of period (in usd)			(347)	(574)
Other comprehensive income (loss) before reclassifications			19	8
Amounts reclassified from AOCI			13	33
Net other comprehensive income (loss)			32	41
Balance, end of period (in usd)	(315)	(533)	(315)	(533)
Hedging activities
Gains (losses)
Balance, beginning of period (in usd)			(126)	(153)
Other comprehensive income (loss) before reclassifications			13	1
Amounts reclassified from AOCI			(2)	16
Net other comprehensive income (loss)			11	17
Balance, end of period (in usd)	(115)	(136)	(115)	(136)
Available-for-sale Debt securities
Gains (losses)
Balance, beginning of period (in usd)			0
Other comprehensive income (loss) before reclassifications			2
Amounts reclassified from AOCI			0
Net other comprehensive income (loss)			2
Balance, end of period (in usd)	2		2
Total
Gains (losses)
Balance, beginning of period (in usd)			(3,380)	(3,314)
Balance, end of period (in usd)	$ (3,767)	$ (3,376)	$ (3,767)	$ (3,376)