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Debt (Senior secured notes) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 subsidiary | Aug. 20, 2010 USD ($)
Debt Instrument [Line Items] |  |
Number of subsidiaries that have guaranteed the debt | subsidiary | 2 |
Senior Secured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount |  | $ 3,900,000,000.0
Prepayment penalty percentage | 1.00% |
Spread over reference rate | 0.50% |
6.5% Senior Secured Bonds, Due September 2014 [Member] |  |
Debt Instrument [Line Items] |  |
Face amount |  | $ 1,350,000,000.00
Stated interest rate |  | 6.50%
6.75% Senior Secured Bonds, Due September 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Face amount |  | $ 1,275,000,000.000
Stated interest rate |  | 6.75%
7.125% Senior Secured Bonds, Due September 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Face amount |  | $ 1,275,000,000.000
Stated interest rate |  | 7.125%

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- Definition Number of subsidiaries that have guaranteed the debt. + References No definition available. + Details
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- Definition Represents the penalty as a percentage of the outstanding principal amount, in case of redemption prior to maturity date. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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