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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%

X

- Definition

Number of subsidiaries that have guaranteed the debt.

+ References

No definition available.

+ Details

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X

- 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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X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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X

- 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

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X

- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Details

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- Details

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