INCOME TAXES - Total Income Tax Expense (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statements of earnings	$ 197	$ 301	$ 299	$ 265	$ (1,585)	$ 359	$ 332	$ 306	$ 1,063	$ (586)	$ 1,408
Other comprehensive income (loss):
Unrealized foreign currency translation gains (losses) during period									10	52	70
Unrealized gains (losses) on investment securities:
Unrealized holding gains (losses) on investment securities during period									(787)	575	962
Reclassification adjustment for realized (gains) losses on investment securities included in net earnings									(12)	1	18
Unrealized gains (losses) on derivatives during period									0	0	1
Pension liability adjustment during period									(8)	3	(16)
Total income tax expense (benefit) related to items of other comprehensive income (loss)									(797)	631	1,035
Additional paid-in capital (exercise of stock options)									0	0	(10)
Total income taxes									$ 266	$ 45	$ 2,433