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Long-term Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 11, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Debt amount $ 6,592   $ 6,042
Long-term Debt, Current Maturities (640)   (88)
Less debt issuance costs (63)   (65)
Discounts (82)   (86)
Total long-term debt 5,807   5,803
Recourse Debt      
Debt Instrument [Line Items]      
Debt amount 6,560   6,008
Recourse Debt | Senior Notes, due 2026      
Debt Instrument [Line Items]      
Debt amount $ 1,000   1,000
Interest rate, stated percentage 7.25%    
Recourse Debt | Senior Notes, due 2027      
Debt Instrument [Line Items]      
Debt amount $ 1,230   1,230
Interest rate, stated percentage 6.625%    
Recourse Debt | Senior Notes, due 2028      
Debt Instrument [Line Items]      
Debt amount $ 821   821
Interest rate, stated percentage 5.75%    
Recourse Debt | Senior Notes, due 2029      
Debt Instrument [Line Items]      
Debt amount $ 733   733
Interest rate, stated percentage 5.25%    
Recourse Debt | Convertible Senior Notes, due 2048      
Debt Instrument [Line Items]      
Debt amount $ 575   575
Interest rate, stated percentage 2.75%    
Recourse Debt | Senior Secured First Lien Notes, due 2024      
Debt Instrument [Line Items]      
Debt amount $ 600   600
Interest rate, stated percentage 3.75%    
Recourse Debt | Senior Secured First Lien Notes, due 2029      
Debt Instrument [Line Items]      
Debt amount $ 500   500
Interest rate, stated percentage 4.45%    
Recourse Debt | Tax-exempt bonds      
Debt Instrument [Line Items]      
Debt amount $ 466   466
Recourse Debt | Tax-exempt bonds | Minimum      
Debt Instrument [Line Items]      
Interest rate, stated percentage 1.30% 1.30%  
Recourse Debt | Tax-exempt bonds | Maximum      
Debt Instrument [Line Items]      
Interest rate, stated percentage 6.00%    
Line of Credit | Revolving Credit Facility | Revolver Facility      
Debt Instrument [Line Items]      
Debt amount $ 635   83
Line of Credit | Revolving Credit Facility | Revolver Facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.75%    
Non Recourse Debt      
Debt Instrument [Line Items]      
Debt amount $ 32   34
Non Recourse Debt | Other      
Debt Instrument [Line Items]      
Debt amount $ 32   $ 34