Employment Benefit Plans Assumptions Used (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Pension Plan, Defined Benefit	Dec. 31, 2012 Pension Plan, Defined Benefit	Dec. 31, 2011 Pension Plan, Defined Benefit	Dec. 31, 2013 Retiree Health and Welfare Benefits		Dec. 31, 2012 Retiree Health and Welfare Benefits		Dec. 31, 2011 Retiree Health and Welfare Benefits		Dec. 31, 2014 Scenario, Forecast [Member]	Dec. 31, 2014 Scenario, Forecast [Member] Pension Plan, Defined Benefit
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate - expense	3.75%	4.50%	5.25%	3.75%		4.50%		5.25%		4.50%
Expected Long-term Return on Assets - expense	6.75%	6.75%	7.50%								6.75%
Rate of Compensation Increase - expense	3.80%	3.80%	3.80%	3.80%		3.80%		3.80%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount Rate - benefit obligations	4.50%	3.75%		4.50%		3.75%
Rate of Compensation Increase - benefit obligations	3.80%	3.80%		3.80%		3.80%
Assumptions Sensitivity Analysis [Abstract]
Effect of 50 basis point decrease in discount rate (Less than $1 million for Pension)	$ (1)			$ 1
Effect of 50 basis point increase in discount rate (Less than $1 million for Pension)	1			(1)
Effect of 50 basis point decrease in rate of return on plan assets	10
Effect of 50 basis point increase in rate of return on plan assets	(10)
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Assumed health care cost trend rate for next year (participants under 65)				8.20%		8.40%		8.70%
Assumed health care cost trend rate for next year (participants over 65)				3.00%	[1]	3.00%	[1]	8.70%	[1]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate				4.50%	[2]	4.50%	[2]	4.50%	[2]
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate				2028	[2]	2028	[2]	2028	[2]
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components				1
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components				(1)
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation				19
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation				$ (16)

[1] Effective January 1, 2013, Medicare-eligible retirees who are enrolled in the retiree medical program received a contribution to a Health Reimbursement Account, which can be used to reimburse plan participants for health insurance premiums and to pay eligible out-of-pocket expenses.

[2] For the years ended December 31, 2013 and 2012, the ultimate trend rate only applies to participants under 65.