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Investment in Unconsolidated Affiliate and Related Party Transactions Summarized Balance Sheet Information of Equity Method Investment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Summarized Financial Information of Equity Method Investment [Line Items]
Current assets	$ 549
Non-current assets	10,683
Current liabilities	720
Non-current liabilities	$ 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.