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Borrowings (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Aug. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
May 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Aug. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Feb. 27, 2018
USD ($)
Debt Instrument [Line Items]                        
Stated interest percentage   3.75%   2.55%               3.75%
Redemption charge             $ 0 $ 0 $ 7,000,000 $ 0    
Aggregate principal amount   $ 100,000,000   $ 300,000,000               $ 700,000,000
Redemption price, percentage   101.00%   101.00%                
Proceeds from issuance of notes   $ 119,000,000   $ 296,000,000                
Repayment of Term Loan $ 1,000,000,000.0               1,000,000,000 0    
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                 0.48      
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