Employee Benefit Plans Pension and Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	$ 227		$ 268
New percentage of eligible earnings used to determine retirement benefits (in hundredths)	5.00%
Recognized pension expense	25		30		27
Non Qualified Pension Plan Expense	1		1		1
Maximum Percentage Of Employee Compensation Eligible For Contribution To Savings Plan	50.00%
Description Of Company Match Under Savings Plan	100% of the first 6% of each employee’s compensation contributed
Savings Plan Benefit Expense	13		12		12
Components of net periodic costs [Abstract]
Service cost - benefits earned during the period	1		0		0
Interest cost on accumulated benefit obligation	13		16		16
Expected return on plan assets	(7)		(7)		(9)
Amortization of transition obligation	6		6		6
Amortization of prior service cost	(1)		0		0
Amortization of loss	4		3		1
Benefit enhancement	0		1		1
Net postretirement benefit cost	16		19		15
Assumptions used to determine net periodic benefit (income) cost [Abstract]
Discount rate (in hundredths)	3.90%		4.80%		5.20%
Expected return on plan assets (in hundredths)	6.00%		6.00%		7.50%
Change in Benefit Obligation [Roll Forward]
Accumulated benefit obligation, beginning of year	351		335
Service cost	1		0
Interest cost	13		16
Benefits paid	(19)		(21)
Participant contributions	3		2
Medicare drug reimbursement	1		2
Actuarial (gain) loss	(39)		17
Accumulated benefit obligation, end of year	311		351		335
Change in Plan Assets [Roll Forward]
Plan assets, beginning of year	115	[1]	116
Benefits paid	(19)		(21)
Employer contributions	9		9
Participant contributions	3		2
Actual investment return	6		9
Plan assets, end of year	114	[2]	115	[1]	116
Amounts Recognized in Balance Sheets [Abstract]
Net liability, end of year	(197)		(236)
Actuarial Assumptions [Abstract]
Discount Rate (in hundredths)	4.75%		3.90%
Expected long-term return on assets	6.00%		6.00%
Assumed Health Care Cost Trend Rates [Abstract]
Prescription drug cost trend rate assumed for the next year	7.00%		9.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.50%		5.50%
Year that the healthcare rate reaches the ultimate trend rate	2018		2017
Year that the prescription drug rate reaches the ultimate trend rate	2018		2017
Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect of One Percentage Point Increase on Postretirement Benefit Obligation	9
Effect of One Percentage Point Decrease on Postretirement Benefit Obligation	8
Effect of One Percentage Point Increase on Total Service and Interest Cost	0
Effect of One Percentage Point Decrease on Total Service and Interest Cost	0
Annualized individual discount rates based on time period, minimum	6 months
Annualized individual discount rates based on time period, maximum	99 years
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	$ 197		$ 236
Age Pre 65 [Member]
Assumed Health Care Cost Trend Rates [Abstract]
Healthcare cost trend rate assumed for the next year	7.00%		9.00%
Age Post 65 [Member] [Member]
Assumed Health Care Cost Trend Rates [Abstract]
Healthcare cost trend rate assumed for the next year	7.50%		9.00%

[1] 74% of the amount invested in mutual funds is in fixed income securities; 18% is in U.S. equities and 8% is in international equities.

[2] 73% of the amount invested in mutual funds is in fixed income securities; 18% is in U.S. equities and 9% is in international equities.