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Borrowings (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
May 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Aug. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Stated interest percentage   2.55%              
Redemption charge         $ 7,000,000 $ 0 $ (7,000,000) $ 0  
Aggregate principal amount   $ 300,000,000              
Redemption price, percentage   101.00%              
Proceeds from issuance of notes   $ 296,000,000              
Proceeds from revolving credit facility             $ 800,000,000 $ 0  
Debt covenant, total indebtedness to total capitalization ratio, maximum       0.60          
Debt covenant, acquisition for consideration, minimum threshold       $ 1,000,000,000          
Debt covenant, total indebtedness to total capitalization ratio, maximum when acquisition for consideration threshold is met, percentage       0.65          
Debt instrument, total indebtedness to total capitalization, percentage             0.53    
Long-term commercial paper $ 0       0   $ 0   $ 100,000,000
Revolving Credit Facility | Unsecured Debt                  
Debt Instrument [Line Items]                  
Debt instrument term       5 years          
Revolving credit facility outstanding       $ 2,200,000,000          
Line of credit facility, additional borrowing capacity available to lender conditions       $ 750,000,000          
Proceeds from revolving credit facility         $ 800,000,000        
Notes Payable, Other Payables                  
Debt Instrument [Line Items]                  
Early redemption of notes $ 500,000,000                
Stated interest percentage 3.60%       3.60%   3.60%    
Redemption charge $ 7,000,000                
Redemption charge, make-whole cash premium 6,000,000                
Unamortized fees and discounts related to the debt redeemed $ 1,000,000                
Short-term Debt                  
Debt Instrument [Line Items]                  
Aggregate principal amount     $ 1,500,000,000            
Debt instrument term     364 days