Financial Statement Presentation New Accounting Pronouncement Adopted (Details)	6 Months Ended
	Jun. 30, 2015 USD ($) integer	Jun. 30, 2014 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 385,000,000
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	(5,000,000)	$ 0
Other Comprehensive Income (Loss), Effect of Change in Accounting Principle, Net of Taxes	13,000,000
Accounting Standard Update 2014-05 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	(18,000,000)
Other Comprehensive Income (Loss), Effect of Change in Accounting Principle, Net of Taxes	13,000,000
Other Noncurrent Assets [Member] | Accounting Standard Update 2014-05 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 1,500,000,000
Mong Duong Subsidiary [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of deliverables in an agreement | integer	2
New Accounting Pronouncement or Change in Accounting Principle, Current Period Disclosures, Revenue Recognized, Amount	$ 0