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Guarantor Financial Statement Information - Narrative (Details) $ in Millions | Dec. 31, 2018 USD ($) subsidiary
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Unsecured senior notes, net | $ 2,459
Ownership percentage | 100.00%
Number of direct wholly owned subsidiaries | subsidiary | 3
Unsecured Senior Notes |
Unsecured senior notes principal amount | $ 2,498
Unsecured senior notes, net | $ 2,459
$600 face value, 6.500% interest rate payable semi-annually, due July 2021 | Unsecured Senior Notes |
Interest rate | 6.50%
Unsecured senior notes principal amount | $ 592
$300 face value, 6.500% interest rate payable semi-annually, due June 2022 | Unsecured Senior Notes |
Interest rate | 6.50%
Unsecured senior notes principal amount | $ 206

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