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Consolidating Financial Information - Narrative (Details) - Senior Notes - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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8.75% due 2020 |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 282,000,000 |
Interest rate, stated percentage | 8.75% | 8.75%
5.125% due 2023 |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 1,000,000,000 |
Interest rate, stated percentage | 5.125% | 5.125%
5% due 2026 |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 900,000,000 |
Interest rate, stated percentage | 5.00% | 5.00%
4.875% due 2027 |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 700,000,000 |
Interest rate, stated percentage | 4.875% | 4.875%

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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