Debt (Schedule Of Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Other notes	$ 184us-gaap_OtherNotesPayable	$ 205us-gaap_OtherNotesPayable
Total debt	9,070us-gaap_DebtAndCapitalLeaseObligations	9,635us-gaap_DebtAndCapitalLeaseObligations
3-month USD LIBOR plus 1 basis point due 2014 [Member]
Debt Instrument [Line Items]
Unsecured debt securities		150
3-month USD LIBOR plus 12.5 basis points due 2017 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	250
0.95% - 5.00% due through 2023 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	4,223	4,832
Debt interest rate - minimum	0.95%
Debt interest rate - maximum	5.00%
Debt Instrument, Maturity Date	Dec. 31, 2024
5.88% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	2,394	2,392
Debt interest rate - minimum	5.88%
Debt interest rate - maximum	6.88%
Debt Instrument, Maturity Date	Dec. 31, 2043
7.25% – 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	1,657	1,672
Debt interest rate - minimum	7.25%
Debt interest rate - maximum	8.75%
Debt Instrument, Maturity Date	Dec. 31, 2043
6.98% - 7.38% notes due through 2021 [Member]
Debt Instrument [Line Items]
Non-recourse debt and notes	201	233
Debt interest rate - minimum	6.98%
Debt interest rate - maximum	7.38%
Debt Instrument, Maturity Date	Dec. 31, 2021
Due Through Two Thousand Twenty-four [Member]
Debt Instrument [Line Items]
Capital lease obligations	$ 161	$ 151
Debt Instrument, Maturity Date	Dec. 31, 2024

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property.

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Including the current and noncurrent portions, the carrying value of notes payable which were initially due after one year or beyond the normal operating cycle, if longer, and which are not otherwise defined in the taxonomy.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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