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INVESTMENTS - Overview (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Investments
Debt securities available-for-sale (AFS)	$ 246,227		$ 246,227		$ 226,876
Debt securities held-to-maturity (HTM)	197,092		197,092		242,382
Marketable equity securities carried at fair value	202		202		151
Non-marketable equity securities carried at fair value	482		482		427
Non-marketable equity securities measured using the measurement alternative	1,545		1,545		1,574
Non-marketable equity securities carried at cost	5,184		5,184		5,247
Total investments	450,732		450,732		476,657
Accrued interest receivable	2,000		2,000		2,000
Interest and dividends on investments
Taxable interest	4,033	$ 4,513	12,076	$ 13,841
Interest exempt from U.S. federal income tax	65	78	220	239
Dividend income	72	92	246	273
Total interest and dividend income on investments	4,170	4,683	12,542	14,353
Gross realized investments losses, excluding losses from other-than-temporary impairment
Gross realized investment gains	120	108	406	394
Gross realized investment losses	(15)	(36)	(42)	(184)
Net realized gains on sales of investments	105	$ 72	364	$ 210
Debt securities AFS
Fair value	246,227		246,227		226,876
Unallocated portfolio layer cumulative basis adjustments					(72)
Gross unrealized gains excluding the effect of unallocated portfolio cumulative basis adjustments	161		161		35
Gross unrealized losses excluding the effect of unallocated portfolio cumulative basis adjustments	(555)		(555)		(1,129)
Mortgage-backed securities
Investments
Debt securities available-for-sale (AFS)	36,648		36,648		29,931
Debt securities AFS
Amortized cost	37,335		37,335		30,835
Gross unrealized gains	77		77		40
Gross unrealized losses	764		764		944
Allowance for credit losses	0		0		0
Fair value	36,648		36,648		29,931
U.S. government-sponsored agency guaranteed
Investments
Debt securities available-for-sale (AFS)	35,673		35,673		29,306
Debt securities AFS
Amortized cost	36,360		36,360		30,208
Gross unrealized gains	76		76		40
Gross unrealized losses	763		763		942
Allowance for credit losses	0		0		0
Fair value	35,673		35,673		29,306
Residential
Investments
Debt securities available-for-sale (AFS)	974		974		624
Debt securities AFS
Amortized cost	974		974		626
Gross unrealized gains	1		1		0
Gross unrealized losses	1		1		2
Allowance for credit losses	0		0		0
Fair value	974		974		624
Commercial
Investments
Debt securities available-for-sale (AFS)	1		1		1
Debt securities AFS
Amortized cost	1		1		1
Gross unrealized gains	0		0		0
Gross unrealized losses	0		0		0
Allowance for credit losses	0		0		0
Fair value	1		1		1
U.S. Treasury
Investments
Debt securities available-for-sale (AFS)	37,018		37,018		52,379
Debt securities AFS
Amortized cost	37,063		37,063		52,630
Gross unrealized gains	69		69		13
Gross unrealized losses	114		114		264
Allowance for credit losses	0		0		0
Fair value	37,018		37,018		52,379
U.S. Treasury and federal agency securities
Investments
Debt securities available-for-sale (AFS)	37,018		37,018		52,379
Debt securities AFS
Amortized cost	37,063		37,063		52,630
Gross unrealized gains	69		69		13
Gross unrealized losses	114		114		264
Allowance for credit losses	0		0		0
Fair value	37,018		37,018		52,379
State and municipal
Investments
Debt securities available-for-sale (AFS)	1,691		1,691		1,658
Debt securities AFS
Amortized cost	1,758		1,758		1,749
Gross unrealized gains	6		6		12
Gross unrealized losses	73		73		103
Allowance for credit losses	0		0		0
Fair value	1,691		1,691		1,658
Foreign government
Investments
Debt securities available-for-sale (AFS)	161,641		161,641		133,359
Debt securities AFS
Amortized cost	161,199		161,199		134,002
Gross unrealized gains	1,018		1,018		444
Gross unrealized losses	576		576		1,087
Allowance for credit losses	0		0		0
Fair value	161,641		161,641		133,359
Corporate
Investments
Debt securities available-for-sale (AFS)	5,372		5,372		4,814
Debt securities AFS
Amortized cost	5,412		5,412		4,923
Gross unrealized gains	34		34		19
Gross unrealized losses	70		70		122
Allowance for credit losses	4		4		6
Fair value	5,372		5,372		4,814
Asset-backed securities
Investments
Debt securities available-for-sale (AFS)	862		862		848
Debt securities AFS
Amortized cost	860		860		856
Gross unrealized gains	4		4		3
Gross unrealized losses	2		2		11
Allowance for credit losses	0		0		0
Fair value	862		862		848
Other debt securities
Investments
Debt securities available-for-sale (AFS)	2,995		2,995		3,887
Debt securities AFS
Amortized cost	2,994		2,994		3,887
Gross unrealized gains	1		1		1
Gross unrealized losses	0		0		1
Allowance for credit losses	0		0		0
Fair value	2,995		2,995		3,887
Debt securities AFS
Investments
Debt securities available-for-sale (AFS)	246,227		246,227		226,876
Debt securities AFS
Amortized cost	246,621		246,621		228,882
Gross unrealized gains	1,209		1,209		532
Gross unrealized losses	1,599		1,599		2,532
Allowance for credit losses	4		4		6
Fair value	246,227		246,227		226,876
Unallocated portfolio layer cumulative basis adjustments	300		300		(200)
Fair value | Non-marketable securities measured using measurement alternative
Investments
Non-marketable equity securities measured using the measurement alternative	$ 34		$ 34		$ 23

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