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Derivative Financial Instruments - Narrative (Details)
R in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
AUD ($)
Mar. 31, 2021
ZAR (R)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
AUD ($)
Dec. 31, 2020
ZAR (R)
Jun. 30, 2019
USD ($)
Derivative Financial Instruments [Abstract]                
Unrealized net income (loss) $ (668,000,000)       $ (610,000,000)      
Interest expense 50,000,000 $ 45,000,000            
Cash flow hedge loss to be reclassified to earnings within twelve months 45,000,000              
Cash flow hedge loss to be reclassified to earnings remainder of the year 34,000,000              
Accumulated other comprehensive loss                
Derivative Financial Instruments [Abstract]                
Unrealized net income (loss) 53,000,000       58,000,000      
Interest Rate Swaps                
Derivative Financial Instruments [Abstract]                
Notional amount               $ 750,000,000
Interest Rate Swaps | Accumulated other comprehensive loss                
Derivative Financial Instruments [Abstract]                
Unrealized net income (loss) (43,000,000)       $ (57,000,000)      
Interest expense 4,000,000 $ 1,000,000            
Australian Dollar Exchange Contract                
Derivative Financial Instruments [Abstract]                
Notional amount 187,000,000   $ 246          
Foreign Exchange Contract, South African Rand | Not Designated as Hedging Instrument                
Derivative Financial Instruments [Abstract]                
Notional amount 37,000,000     R 540        
Foreign Exchange Contract, Australian Dollars | Not Designated as Hedging Instrument                
Derivative Financial Instruments [Abstract]                
Notional amount 44,000,000   $ 58          
Foreign Exchange Contract, South African Rand | Not Designated as Hedging Instrument                
Derivative Financial Instruments [Abstract]                
Notional amount 24,000,000           R 354  
Foreign Exchange Contract, Australian Dollars | Not Designated as Hedging Instrument                
Derivative Financial Instruments [Abstract]                
Notional amount $ 41,000,000         $ 54