Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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-Name Accounting Standards Codification

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-Publisher SEC

-Name Regulation S-X (SX)

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Gross amount of debt extinguished.

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The amount of cash paid for interest during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

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-SubTopic 10

-Section 45

-Paragraph 25

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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Notes Payable Maturities of Long Term Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Debt Instrument
Repayments of Long-term Debt	$ 1,073us-gaap_RepaymentsOfLongTermDebt	$ 359us-gaap_RepaymentsOfLongTermDebt	$ 557us-gaap_RepaymentsOfLongTermDebt
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	117
Long-term Debt, Maturities, Repayments of Principal in Year Two	176
Long-term Debt, Maturities, Repayments of Principal in Year Three	530
Long-term Debt, Maturities, Repayments of Principal in Year Four	531
Long-term Debt, Maturities, Repayments of Principal in Year Five	464
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,005
Long-term Debt	2,823us-gaap_DebtInstrumentCarryingAmount
Interest Paid	140us-gaap_InterestPaid	87us-gaap_InterestPaid	65us-gaap_InterestPaid
Payments of Debt Extinguishment Costs	0	0	6
Unsecured notes, net of discount, interest payable semi-annually at 5.25%, due March 2013
Debt Instrument
Extinguishment of Debt, Amount				$ 237