Derivative Financial Instruments and Risk Management (Details 5) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Offsetting Assets and Liabilities
Gross Amount of Recognized Assets	$ 138	$ 238	$ 255
Gross Amounts Offset	0	0	0
Net Amount of Assets	138	238	255
Gross Amounts Not Offset, Financial Instruments	(9)	(12)	(11)
Gross Amounts Not Offset, Cash Collateral Received	0	0	0
Net Amount	129	226	244
Gross Amount of Recognized Liabilities	(10)	(15)	(23)
Gross Amounts Offset	0	0	0
Net Amount of Liabilities	(10)	(15)	(23)
Gross Amounts Not Offset, Financial Instruments	9	12	11
Gross Amounts Not Offset, Cash Collateral Received	0	0	0
Net Amount	$ (1)	$ (3)	$ (12)