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Equity Investments (Schedule of Financial Information Related to Unconsolidated Entities Included in Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Equity Investments [Abstract]
Current assets	$ 268	$ 236
Noncurrent assets	861	790
Total assets	1,129	1,026
Current liabilities	117	99
Noncurrent liabilities	2	2
Members' equity	1,010	925
Total liabilities and equity	$ 1,129	$ 1,026

The amount of assets reported by an equity method investment of the entity.

The amount of current assets reported by an equity method investment of the entity.

The amount of current liabilities reported by an equity method investment of the entity.

The amount of liabilities and equity reported by an equity method investment of the entity.

The amount of noncurrent assets reported by an equity method investment of the entity.

The amount of noncurrent liabilities reported by an equity method investment of the entity.