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BORROWINGS AND LINES OF CREDIT - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 27, 2020
USD ($)
Feb. 10, 2020
USD ($)
Mar. 27, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 19, 2020
USD ($)
Jun. 02, 2020
USD ($)
Feb. 27, 2020
USD ($)
debt_series
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                      
Aggregate principal balance                   $ 11,000,000,000.0  
Issuance of long-term debt           $ 11,734,000,000 $ 77,000,000        
Net transfers to parent     $ 10,900,000,000     10,359,000,000 548,000,000        
Debt instrument, covenant, modification period threshold for provision of terms                 $ 100,000,000    
Long-term debt, gross       $ 12,117,000,000   12,117,000,000         $ 319,000,000
Repayment of long-term debt           $ 36,000,000 37,000,000        
Weighted average interest rate       2.70%   2.70%          
Interest expense, debt       $ 85,000,000   $ 126,000,000          
Interest expense, debt, excluding amortization       83,000,000   118,000,000          
Amortization of debt issuance costs       $ 2,000,000   3,000,000          
Amortization of debt discount (premium)           $ 5,000,000          
Weighted Average                      
Debt Instrument [Line Items]                      
Average maturity of long-term debt       12 years   12 years          
Term Loan                      
Debt Instrument [Line Items]                      
Revolving credit facility, maximum borrowing capacity   $ 1,750,000,000                  
Issuance of long-term debt $ 1,750,000,000                    
Long-term debt, gross       $ 1,750,000,000   $ 1,750,000,000         0
Interest rate, stated percentage       2.195%   2.195%          
Unsecured Debt                      
Debt Instrument [Line Items]                      
Aggregate principal balance                   $ 9,250,000,000  
Series of notes issuance | debt_series                   6  
Unsecured Debt | 2.700% Notes due February 15, 2031                      
Debt Instrument [Line Items]                      
Aggregate principal balance               $ 750,000,000      
Long-term debt, gross               $ 750,000,000     0
Interest rate, stated percentage       2.70%   2.70%          
Other Debt                      
Debt Instrument [Line Items]                      
Long-term debt, gross       $ 367,000,000   $ 367,000,000         $ 319,000,000
Other Debt | Project Financing Arrangements                      
Debt Instrument [Line Items]                      
Aggregate principal balance       75,000,000   75,000,000 $ 77,000,000        
Commercial Paper                      
Debt Instrument [Line Items]                      
Aggregate principal balance       2,000,000,000.0   2,000,000,000.0          
Short-term debt       0   $ 0          
London Interbank Offered Rate (LIBOR) | Term Loan                      
Debt Instrument [Line Items]                      
Basis spread on variable rate         1.125% 1.125%          
Revolving Credit Facility | Line of Credit                      
Debt Instrument [Line Items]                      
Revolving credit facility, maximum borrowing capacity   $ 2,000,000,000.0   $ 0   $ 0          
Commitment fee percentage   0.125%                  
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Line of Credit                      
Debt Instrument [Line Items]                      
Basis spread on variable rate         1.25%