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

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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

+ Details

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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

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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- Details

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- Details

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- Details

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Debt - Recourse Debt (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended		6 Months Ended
Debt - Recourse Debt (Details) - USD ($) $ in Millions	Mar. 31, 2017	May 31, 2016	Jan. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 01, 2017	May 16, 2016	Jan. 01, 2016
Debt Instrument [Line Items]
Redeemed notes			$ 125
Gain (loss) on extinguishment of debt				$ (12)	$ 0	$ 5	$ 4
LIBOR 2.00% Senior Notes Due in 2022 [Member]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt						(6)
7.375% Senior Notes Due 2021 [Member] [Member]
Debt Instrument [Line Items]
Redeemed notes	$ 276
8.0% Senior Notes Due 2020 [Domain]
Debt Instrument [Line Items]
Redeemed notes	$ 24
Senior Unsecured Note LIBOR plus 3% due 2019 [Member]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ 4
Senior Notes [Member] \| LIBOR 2.00% Senior Notes Due in 2022 [Member]
Debt Instrument [Line Items]
Redeemed notes					$ 517
Issued senior notes				$ 525		525
Senior Notes [Member] \| 6.00% senior notes due 2026 [Domain]
Debt Instrument [Line Items]
Interest rate on senior notes									6.00%
Issued senior notes									$ 500
Senior Notes [Member] \| Senior Unsecured Note LIBOR plus 3% due 2019 [Member]
Debt Instrument [Line Items]
Redeemed notes		$ 495
Unsecured Debt [Member] \| 7.375% Senior Notes Due 2021 [Member] [Member]
Debt Instrument [Line Items]
Interest rate on senior notes								7.375%		7.375%
Unsecured Debt [Member] \| 4.875% Senior Notes Due 2023 [Member] [Member]
Debt Instrument [Line Items]
Interest rate on senior notes										4.875%
Gain (loss) on extinguishment of debt							$ 7
Unsecured Debt [Member] \| 5.5% Senior Notes Due 2024 [Member] [Member]
Debt Instrument [Line Items]
Interest rate on senior notes										5.50%
Unsecured Debt [Member] \| 5.5% Senior Notes Due 2025 [Member] [Member]
Debt Instrument [Line Items]
Interest rate on senior notes										5.50%
Unsecured Debt [Member] \| 8.0% Senior Notes Due 2020 [Domain]
Debt Instrument [Line Items]
Interest rate on senior notes								8.00%
Gain (loss) on extinguishment of debt						$ (47)
London Interbank Offered Rate (LIBOR) [Member] \| LIBOR 2.00% Senior Notes Due in 2022 [Member] \| Recourse Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						2.00%
London Interbank Offered Rate (LIBOR) [Member] \| Senior Unsecured Note LIBOR plus 3% due 2019 [Member] \| Recourse Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						3.00%