-- None. No documentation exists for this element. --

No definition available.

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- Definition

The year when the debt instrument is scheduled to be fully repaid.

+ References

No definition available.

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- Definition

Prepayment penalty related to early redemption of debt instrument.

+ References

No definition available.

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Balance Type:	credit
Period Type:	duration

- Definition

Amount of unrestricted cash the Company is required to maintain under the facility.

+ References

No definition available.

+ Details

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- Definition

Cash outflow used to repay debt and any associated redemption premiums, accrued interest and related fees and expenses.

+ References

No definition available.

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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
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-Name Accounting Standards Codification
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- References

No definition available.

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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.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

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

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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- Definition

Fair value of the amount outstanding under the credit facility.

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- Definition

Amount of increase (decrease) of the credit facility.

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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.

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No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Corporate Debt (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
Corporate Debt (Details) - USD ($) $ in Millions	Feb. 28, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Nov. 30, 2014
Debt Disclosure (Textuals) [Abstract]
Losses on early extinguishment of debt		$ 0	$ 73
Corporate Debt Securities [Member]
Debt Instrument [Line Items]
Face Value		1,003		$ 1,008
Unamortized discount		(10)		(11)
Total corporate debt		993		997
Interest Bearing Total [Member] \| Corporate Debt Securities [Member]
Debt Instrument [Line Items]
Face Value		1,000		1,000
Unamortized discount		(10)		(11)
Total corporate debt		$ 990		$ 989
Senior Notes Interest Bearing Five and Three Eighths Percent [Member]
Debt Instrument Interest Rate Stated Percentage [Abstract]
Debt instrument maturity year		2022		2022
Senior Notes Interest Bearing Five and Three Eighths Percent [Member] \| Corporate Debt Securities [Member]
Debt Instrument [Line Items]
Face Value		$ 540		$ 540
Unamortized discount		(5)		(6)
Total corporate debt		$ 535		$ 534
Debt Instrument Interest Rate Stated Percentage [Abstract]
Debt instrument, interest rate, stated percentage		5.375%		5.375%
Senior Notes Interest Bearing Four And Five Eighths Percent [Member]
Debt Instrument Interest Rate Stated Percentage [Abstract]
Debt instrument maturity year		2023	2023	2023
Senior Notes Interest Bearing Four And Five Eighths Percent [Member] \| Corporate Debt Securities [Member]
Debt Instrument [Line Items]
Face Value		$ 460	$ 460	$ 460
Unamortized discount		(5)		(5)
Total corporate debt		$ 455		$ 455
Debt Instrument Interest Rate Stated Percentage [Abstract]
Debt instrument, interest rate, stated percentage		4.625%	4.625%	4.625%
Noninterest Bearing Convertible Debentures [Member]
Debt Instrument Interest Rate Stated Percentage [Abstract]
Debt instrument maturity year		2019		2019
Noninterest Bearing Convertible Debentures [Member] \| Corporate Debt Securities [Member]
Debt Instrument [Line Items]
Face Value		$ 3		$ 8
Unamortized discount		0		0
Total corporate debt		$ 3		$ 8
Debt Instrument Interest Rate Stated Percentage [Abstract]
Debt instrument, interest rate, stated percentage		0.00%		0.00%
Senior Notes Interest Bearing Six And Three Eighths Percent [Member]
Debt Disclosure (Textuals) [Abstract]
Repayments of Long-Term Debt and Associated Premiums, Interest and Fees			$ 432
Losses on early extinguishment of debt			73
Debt Instrument, Redemption Premium			$ 68
Senior Notes Interest Bearing Six And Three Eighths Percent [Member] \| Corporate Debt Securities [Member]
Debt Instrument Interest Rate Stated Percentage [Abstract]
Debt instrument, interest rate, stated percentage			6.375%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250			$ 200
Line of Credit Facility, Increase (Decrease), Net	$ 50
Line of Credit Facility, Fair Value of Amount Outstanding		$ 0
Line of Credit Facility, Expiration Date		Nov. 30, 2017
Line of Credit Facility, Unrestricted Cash Minimum		$ 100