Employee Benefits Schedule of Defined Benefit Plan Disclosures (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
As of January 1				$ 596
Noncurrent asset	(35)	(32)		(35)
Noncurrent liability	(154)	(247)		(154)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
As of January 1	705	728	634
Service cost	17	14	12
Interest cost on benefit obligation	30	31	29
Participants’ contributions	0	0
Actuarial loss (gain)	(38)	77
Defined Benefit Plan, Special Termination Benefits	0	0
Benefit payments	(32)	(28)
As of January 1	537	487		596
Unfunded position as of December 31	(109)	(191)
Net actuarial loss (gain) included in comprehensive income	(89)	40
Defined Benefit Plan, Amortization of Gains (Losses)	(24)	(17)	(8)
Amortization of prior service cost included in comprehensive income	0	0
Total Amounts included in comprehensive income	(113)	23
Defined Benefit Plan, Accumulated Benefit Obligation	631	640
Actual return on plan assets	91	78
Company contributions	0	0
Noncurrent asset	0	0
Current liability	0	0
Noncurrent liability	(109)	(191)
Net actuarial loss	186	298
Prior service cost	0	1
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	186	299
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate	4.84%	4.24%
Discount rate used to calculate benefit obligation	4.24%	5.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase	3.65%	3.65%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.65%	3.71%
Long-term rate of return on plan assets	7.50%	8.25%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.25%	8.25%
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
As of January 1	77	84	75
Service cost	2	2	2
Interest cost on benefit obligation	3	3	4
Participants’ contributions	2	2
Actuarial loss (gain)	(9)	7
Defined Benefit Plan, Special Termination Benefits	1	1
Benefit payments	(6)	(6)
As of January 1	28	27		32
Unfunded position as of December 31	(45)	(56)
Net actuarial loss (gain) included in comprehensive income	11	(5)
Defined Benefit Plan, Amortization of Gains (Losses)	(1)	(1)	(1)
Amortization of prior service cost included in comprehensive income	(1)	(1)
Total Amounts included in comprehensive income	(13)	3
Actual return on plan assets	5	3
Company contributions	3	2
Noncurrent asset	0	0
Current liability	0	0
Noncurrent liability	(45)	(56)
Net actuarial loss	6	18
Prior service cost	2	4
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	8	22
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate	3.46%	2.77%
Defined Benefit Plan Discount rate - upper range	4.96%	4.13%
Discount rate used to calculate benefit obligation	2.77%	3.76%
Defined Benefit Plan Cost Discount rate - upper range	4.13%	4.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase	4.58%	4.58%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	4.58%	4.58%
Long-term rate of return on plan assets	6.46%	6.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.89%	7.09%
Non Qualified Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
As of January 1	24	27	27
Service cost	0	0	0
Interest cost on benefit obligation	1	1	1
Participants’ contributions	0	0
Actuarial loss (gain)	(2)	1
Defined Benefit Plan, Special Termination Benefits	0	0
Benefit payments	(2)	(2)
As of January 1	15	17		16
Unfunded position as of December 31	(8)	(12)
Net actuarial loss (gain) included in comprehensive income	1	(2)
Defined Benefit Plan, Amortization of Gains (Losses)	(1)	(1)	(1)
Amortization of prior service cost included in comprehensive income	0	0
Total Amounts included in comprehensive income	(2)	1
Defined Benefit Plan, Accumulated Benefit Obligation	24	27
Actual return on plan assets	3	0
Company contributions	0	0
Noncurrent asset	(16)	(15)
Current liability	(2)	(2)
Noncurrent liability	(22)	(25)
Net actuarial loss	9	11
Prior service cost	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ 9	$ 11
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate	4.84%	4.24%
Discount rate used to calculate benefit obligation	4.24%	5.00%