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DEBT (Revolving Credit Facility) (Details) - USD ($)
1 Months Ended 6 Months Ended
Aug. 31, 2019
Jun. 30, 2015
Jun. 30, 2019
Oct. 31, 2020
Sep. 30, 2020
Apr. 30, 2020
Dec. 31, 2019
Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Revolving credit facility, maximum borrowing capacity $ 2,000,000,000.0 $ 2,000,000,000.0          
Line of credit facility, term 5 years 5 years          
Line of credit, current         $ 0   $ 0
Proceeds from revolving credit facility and short-term borrowings     $ 400,000,000        
Weighted average interest rate     3.50%        
Debt instrument, covenant, minimum liquidity amount           $ 4,500,000,000  
Revolving Credit Facility | Subsequent Event              
Line of Credit Facility [Line Items]              
Debt instrument, covenant, pro forma liquidity required for distribution and share repurchases       $ 6,000,000,000.0      
Revolving Credit Facility | Minimum              
Line of Credit Facility [Line Items]              
Commitment fee rate 0.07%            
Revolving Credit Facility | Minimum | Rate 2C              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 0.00%            
Revolving Credit Facility | Maximum              
Line of Credit Facility [Line Items]              
Commitment fee rate 0.20%            
Revolving Credit Facility | Maximum | Rate 2C              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 0.50%            
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Rate 1              
Line of Credit Facility [Line Items]              
London Inter-bank Offer Rate (LIBOR) 0.00%            
Basis spread on variable rate 0.875%            
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Rate 1              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 1.50%            
Revolving Credit Facility | Federal Funds Purchased | Rate 2B              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 0.50%            
Revolving Credit Facility | One Month LIBOR | Rate 2C              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 1.00%            
Revolving Credit Facility | One Month LIBOR | Minimum | Rate 2C              
Line of Credit Facility [Line Items]              
London Inter-bank Offer Rate (LIBOR) 0.00%            
Letter of Credit              
Line of Credit Facility [Line Items]              
Revolving credit facility, maximum borrowing capacity $ 80,000,000            
Letters of credit issued         $ 4,000,000   $ 5,000,000
Swingline Loans              
Line of Credit Facility [Line Items]              
Revolving credit facility, maximum borrowing capacity $ 100,000,000