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DEBT - Commercial Paper and Other Short-term Borrowings (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Feb. 10, 2022
Dec. 31, 2021
Commercial paper      
Short-term Debt [Line Items]      
Maximum borrowing capacity   $ 4,000,000,000 $ 2,000,000,000
Maximum amount outstanding during period $ 1,500,000,000    
Short-term debt outstanding $ 691,000,000   $ 955,000,000
Weighted average annual interest rate (percent) 0.89%    
FHLB borrowings      
Short-term Debt [Line Items]      
Short-term debt outstanding $ 0