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Financial instruments and risk management - Interest Rate Risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Apr. 10, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Principal outstanding $ 4,926    
Hedging instruments (180)    
Net exposure 4,746    
Impact of 1% increase in rates 47    
Total debt principal 6,759   $ 7,086
Total floating rate debt obligations      
Debt Instrument [Line Items]      
Principal outstanding 6,283    
Hedging instruments (180)    
Net exposure 6,103    
Impact of 1% increase in rates 61    
Total floating rate debt obligations | Senior Credit Facilities      
Debt Instrument [Line Items]      
Principal outstanding 5,662    
Hedging instruments (4,500)    
Net exposure 1,162    
Impact of 1% increase in rates 12    
Total floating rate debt obligations | Ineffective portion of interest rate cap      
Debt Instrument [Line Items]      
Principal outstanding 0    
Hedging instruments 4,320    
Net exposure 4,320    
Impact of 1% increase in rates $ 43    
Impact that would be mitigated (as a percent) 4.00%    
Hypothetical increase in rates (as a percent) 1.00%    
Total floating rate debt obligations | Debt contained within VIEs      
Debt Instrument [Line Items]      
Principal outstanding $ 621    
Hedging instruments 0    
Net exposure 621    
Impact of 1% increase in rates 6    
Less: Cash and Restricted Cash      
Debt Instrument [Line Items]      
Principal outstanding (1,357)    
Hedging instruments 0    
Net exposure (1,357)    
Impact of 1% increase in rates (14)    
Secured Debt | Debt contained within VIEs      
Debt Instrument [Line Items]      
Total debt principal 621   655
Secured Debt | Senior secured notes      
Debt Instrument [Line Items]      
Total debt principal $ 476 $ 476 $ 769