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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 |  |

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