Face (par) amount of debt instrument at time of issuance.

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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Balance Type:	credit
Period Type:	instant

- 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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Balance Type:	na
Period Type:	instant

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Details

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- Details

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Subsequent Events Subsequent Events - Narrative (Details) - USD ($) $ in Millions				9 Months Ended
	Oct. 16, 2017	Oct. 13, 2017	Oct. 12, 2017	Sep. 30, 2017	Sep. 30, 2016	Oct. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 9,775				$ 9,989
Proceeds from issuance of senior notes, net				742	$ 0
Cash Paid to Purchase Debt				1,751	$ 1,979
Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Current Borrowing Capacity								3,800
Senior Notes [Member] \| 8.00% Senior Notes Due 2025 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 1,000				$ 1,000
Debt Instrument, Interest Rate, Stated Percentage				8.00%				8.00%
Senior Notes [Member] \| 8.00% Senior Notes Due 2027 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 750			$ 750	$ 0
Debt Instrument, Interest Rate, Stated Percentage				8.00%			8.00%
Debt Instrument, Redemption Price, Percentage				108.00%
Senior Notes [Member] \| 8.00% Senior Secured Second Lien Notes Due 2022 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 1,737				2,419
Debt Instrument, Interest Rate, Stated Percentage				8.00%
Senior Notes [Member] \| 6.625% Senior Notes Due 2020 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 572				780
Debt Instrument, Interest Rate, Stated Percentage				6.625%
Senior Notes [Member] \| 6.875% Senior Notes Due 2020 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 279				279
Debt Instrument, Interest Rate, Stated Percentage				6.875%
Senior Notes [Member] \| 6.125% Senior Notes Due 2021 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 550				550
Debt Instrument, Interest Rate, Stated Percentage				6.125%
Senior Notes [Member] \| 5.375% Senior Notes Due 2021 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 270				270
Debt Instrument, Interest Rate, Stated Percentage				5.375%
Term Loan [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 1,500				$ 1,500
Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from issuance of senior notes, net			$ 842
Subsequent Event [Member] \| Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Current Borrowing Capacity						$ 3,800
Subsequent Event [Member] \| Senior Notes [Member]
Subsequent Event [Line Items]
Cash Paid to Purchase Debt		$ 550
Subsequent Event [Member] \| Senior Notes [Member] \| 8.00% Senior Notes Due 2025 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount			$ 300
Debt Instrument, Interest Rate, Stated Percentage			8.00%
Debt Instrument, Redemption Price, Percentage			101.25%
Subsequent Event [Member] \| Senior Notes [Member] \| 8.00% Senior Notes Due 2027 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount			$ 550
Debt Instrument, Interest Rate, Stated Percentage			8.00%
Debt Instrument, Redemption Price, Percentage			99.75%
Subsequent Event [Member] \| Senior Notes [Member] \| 8.00% Senior Secured Second Lien Notes Due 2022 [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.00%
Cash Paid to Purchase Debt		$ 350
Debt Instrument, Repurchase Amount		$ 320
Subsequent Event [Member] \| Senior Notes [Member] \| 6.625% Senior Notes Due 2020 [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.625%
Cash Paid to Purchase Debt		$ 141
Debt Instrument, Repurchase Amount		$ 136
Subsequent Event [Member] \| Senior Notes [Member] \| 6.875% Senior Notes Due 2020 [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.875%
Cash Paid to Purchase Debt		$ 53
Debt Instrument, Repurchase Amount		$ 51
Subsequent Event [Member] \| Senior Notes [Member] \| 6.125% Senior Notes Due 2021 [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.125%
Cash Paid to Purchase Debt		$ 3
Debt Instrument, Repurchase Amount		$ 3
Subsequent Event [Member] \| Senior Notes [Member] \| 5.375% Senior Notes Due 2021 [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.375%
Cash Paid to Purchase Debt		$ 3
Debt Instrument, Repurchase Amount		$ 3
Subsequent Event [Member] \| Term Loan [Member]
Subsequent Event [Line Items]
Cash Paid to Purchase Debt	$ 258
Debt Instrument, Repurchase Amount	$ 237