INVESTMENT SECURITIES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest, current	$ 473	$ 466
Accrued interest, current, statement of financial position	All other current assets (Note 9)	All other current assets (Note 9)
Debt securities in unrealized loss position, total	$ 21,876	$ 18,730
Debt securities in unrealized loss position, 12 months or more	14,011	17,146
Gross unrealized losses, 12 months or more	(2,795)	(2,370)
Gross unrealized losses	(3,148)	(2,406)
Investments without readily determinable fair value	1,439	974
Fair value adjustments, including impairment	159	70	$ 0
Assets held by insurance regulators	700
Assets held in trust accounts, reinsurance agreements	29,800
CMBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized losses	(119)
Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized losses	(52)
Insurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments without readily determinable fair value	$ 1,410	$ 939

Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

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