INCOME TAXES - Total Income Tax Expense (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statements of earnings	$ 265	$ (1,303)	$ 265	$ 154	$ 276	$ 259	$ 292	$ 314	$ (619)	$ 1,141	$ 1,063
Other comprehensive income (loss):
Unrealized foreign currency translation gains (losses) during period									(3)	27	10
Unrealized gains (losses) on investment securities:
Unrealized holding gains (losses) on investment securities during period									223	1,532	(787)
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings									33	5	(12)
Unrealized gains (losses) on derivatives during period									0	(3)	0
Pension liability adjustment during period									(2)	(18)	(8)
Total income tax expense (benefit) related to items of other comprehensive income (loss)									251	1,543	(797)
Total income taxes									$ (368)	$ 2,684	$ 266