Financial and Derivative Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Offsetting Assets [Abstract]
Derivative Assets, Gross Amount Recognized	$ 1,836	$ 732
Derivative Assets, Gross Amounts Offset	1,766	704
Derivative Assets, Net Amounts Presented	70	28
Derivative Assets, Gross Amounts Not Offset	8	27
Derivative Assets, Net Amount	62	1
Offsetting Liabilities [Abstract]
Derivative Liabilities, Gross Amount Recognized	1,800	793
Derivative Liabilities, Gross Amounts Offset	1,766	704
Derivative Liabilities	34	89
Derivative Liabilities, Gross Amount Not Offset	0	0
Derivative Liabilities, Net Amount	$ 34	$ 89

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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