DEBT - Commercial Paper and Other Short-Term Borrowings (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Proceeds from short-term borrowings		$ 100,000,000	$ 0	$ 0
Repayment of short-term borrowings		100,000,000	0	$ 0
Commercial Paper
Short-term Debt [Line Items]
Maximum amount outstanding during period		3,300,000,000
Short-term debt outstanding	$ 871,000,000	$ 871,000,000	595,000,000
Weighted average annual interest rate (percent)	5.68%	5.68%
Federal Home Loan Bank Advances
Short-term Debt [Line Items]
Short-term debt outstanding	$ 0	$ 0	$ 0
Proceeds from short-term borrowings	100,000,000
Repayment of short-term borrowings	$ 100,000,000