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DEBT - Revolving Credit Agreements (Details) - USD ($)
1 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Term loan      
Line of Credit Facility [Line Items]      
Debt to capitalization percentage, maximum 60.00%   60.00%
Actual debt to capitalization percentage 45.30%   45.30%
Revolving credit facility      
Line of Credit Facility [Line Items]      
Debt to capitalization percentage, maximum 60.00%   60.00%
Uncommitted incremental loan facility $ 750,000,000   $ 750,000,000
Maximum borrowing capacity including uncommitted incremental loan facility 4,750,000,000   4,750,000,000
Outstanding borrowings 0   $ 0
Revolving credit facility | 5-year unsecured revolving credit agreement      
Line of Credit Facility [Line Items]      
Debt instrument term (in years)   5 years 5 years
Maximum borrowing capacity   $ 2,500,000,000  
Facility fee (percent)     0.15%
Remaining borrowing capacity $ 2,400,000,000   $ 2,400,000,000
Revolving credit facility | 5-year unsecured revolving credit agreement | Minimum      
Line of Credit Facility [Line Items]      
Facility fee (percent)     0.09%
Revolving credit facility | 5-year unsecured revolving credit agreement | Maximum      
Line of Credit Facility [Line Items]      
Facility fee (percent)     0.225%
Revolving credit facility | 5-year unsecured revolving credit agreement | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent)     1.10%
Revolving credit facility | 5-year unsecured revolving credit agreement | LIBOR | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent)     0.91%
Revolving credit facility | 5-year unsecured revolving credit agreement | LIBOR | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent)     1.40%
Revolving credit facility | 364-day unsecured revolving credit agreement      
Line of Credit Facility [Line Items]      
Debt instrument term (in years) 364 days   364 days
Maximum borrowing capacity $ 1,500,000,000   $ 1,500,000,000
Facility fee (percent)     0.10%
Remaining borrowing capacity 1,500,000,000   $ 1,500,000,000
Revolving credit facility | 364-day unsecured revolving credit agreement | Minimum      
Line of Credit Facility [Line Items]      
Facility fee (percent)     0.06%
Revolving credit facility | 364-day unsecured revolving credit agreement | Maximum      
Line of Credit Facility [Line Items]      
Facility fee (percent)     0.15%
Revolving credit facility | 364-day unsecured revolving credit agreement | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent)     1.15%
Revolving credit facility | 364-day unsecured revolving credit agreement | LIBOR | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent)     0.94%
Revolving credit facility | 364-day unsecured revolving credit agreement | LIBOR | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (percent)     1.35%
Letter of credit      
Line of Credit Facility [Line Items]      
Outstanding borrowings $ 73,000,000   $ 73,000,000