Income Taxes Reconciliaton of Changes in Unrecognized Tax Benefits Liabilities / (Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 48	$ 110	$ 112
Additions for tax positions related to current year	16	12	47
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	1
Reductions for tax positions taken in prior years		(2)	(40)
Additions for tax positions as a result of settlements	1		8
Reductions for tax positions as a result of settlements		(53)
Reductions for tax positions as a result of lapse of statute of limitations	(10)	(19)	(17)
Ending Balance	56	48	110
Unrecognized Tax Benefits	56	48	110
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 38