Derivative Financial Instruments (Schedule of Offsetting Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative Liabilities [Abstract]
Gross amount recognized	$ 5	$ 23
Gross amount offset in the consolidated balance sheets	0	0
Net amount presented in the consolidated balance sheets	5	23
Gross amount not offset in the consolidated balance sheets	1	4
Net amount	$ 4us-gaap_DerivativeLiabilities	$ 19us-gaap_DerivativeLiabilities

Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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