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DEBT - Commercial Paper, Other Short-term Borrowings and Bridge Loan Financing (Details) - USD ($)
1 Months Ended 6 Months Ended
Apr. 30, 2021
Jun. 30, 2021
May 31, 2021
Dec. 31, 2020
Commercial paper        
Short-term Debt [Line Items]        
Maximum borrowing capacity   $ 2,000,000,000    
Maximum amount outstanding during period   1,300,000,000    
Short-term debt outstanding   $ 1,109,000,000   $ 600,000,000
Weighted average annual interest rate (percent)   0.32%    
FHLB borrowings        
Short-term Debt [Line Items]        
Short-term debt outstanding   $ 0    
Bridge loan        
Short-term Debt [Line Items]        
Maximum borrowing capacity $ 3,500,000,000   $ 3,000,000,000.0  
Debt instrument term 364 days