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Investment in Unconsolidated Affiliates Summarized Balance Sheet Information of Equity Method Investment (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Summarized Balance Sheet Information of Equity Method Investment [Abstract]
Current assets	$ 520	$ 549
Non-current assets	11,172	10,683
Current liabilities	519	720
Non-current liabilities	$ 2,347	$ 2,331

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 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.