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Significant Transactions - SFC's Medium-Term Note Issuances (Details) - SFC - Senior Debt - USD ($)
Dec. 31, 2018
Aug. 10, 2018
May 11, 2018
Mar. 12, 2018
May 30, 2017
May 15, 2017
6.875% Senior Notes Due 2025            
Debt Instrument [Line Items]            
Interest rate       6.875%    
Debt instrument, face amount       $ 1,250,000,000    
7.125% Senior Notes Due 2026            
Debt Instrument [Line Items]            
Interest rate 7.125%          
Debt instrument, face amount $ 1,600,000,000 $ 700,000,000 $ 900,000,000      
Guaranty Agreements | 6.875% Senior Notes Due 2025            
Debt Instrument [Line Items]            
Interest rate 6.875%          
Guaranty Agreements | 7.125% Senior Notes Due 2026            
Debt Instrument [Line Items]            
Interest rate 7.125%          
Guaranty Agreements | 6.125% Senior Notes Due 2022            
Debt Instrument [Line Items]            
Interest rate 6.125%         6.125%
Debt instrument, face amount         $ 500,000,000 $ 500,000,000
Guaranty Agreements | 5.625% Senior Notes Due 2023            
Debt Instrument [Line Items]            
Interest rate 5.625%          
Debt instrument, face amount $ 875,000,000          
Guaranty Agreements | 8.25% Senior Notes Due 2020            
Debt Instrument [Line Items]            
Interest rate 8.25%          
Debt instrument, face amount $ 1,000,000,000