Derivative Financial Instruments and Risk Management (Details 6) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Offsetting Assets and Liabilities [Abstract]
Gross Amount of Recognized Assets	$ 119	$ 138
Gross Amounts Offset	0	0
Net Amount of Assets	119	138
Gross Amounts Not Offset, Financial Instruments	(7)	(9)
Gross Amounts Not Offset, Cash Collateral Received	0	0
Net Amount	112	129
Gross Amount of Recognized Liabilities	(12)	(10)
Gross Amounts Offset	0	0
Net Amount of Liabilities	(12)	(10)
Gross Amounts Not Offset, Financial Instruments	7	9
Gross Amounts Not Offset, Cash Collateral Pledged	0	0
Net Amount	$ (5)	$ (1)