Employee Benefits Schedule of Changes in Fair Value of Plan Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		12 Months Ended					12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 Private Equity Funds [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] alternative assets [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] alternative assets [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Private Equity Funds [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Private Equity Funds [Member]	Dec. 31, 2012 alternative assets [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 596	$ 537		$ 31	$ 32	$ 0	$ 30	$ 32	$ 62	$ 32	$ 32
Unrealized gain on assets	4		2					(4)				(6)
Available-for-sale Securities, Gross Realized Gain (Loss)	(2)		(1)					5				6
Purchases and sales, net	$ (3)		$ (1)					$ (31)				$ (30)