Employee Benefits Schedule of Fair Value, Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Pension Plan assets:
Money market funds		$ 1
Equity securities:
Domestic	185	165
International equity securities - defined benefit pension plan assets	185	166
Debt securities:
Domestic government and corporate credit	181	165
Corporate credit	14	8
Private equity funds	31	32
Defined Benefit Plan, Fair Value of Plan Assets	596	537
Other Postretirement Benefit Plans assets: [Abstract]
Money market funds	10	8
Domestic equity securities - Other postretirement benefit plan assets at fair value	10	9
International equity securities - other post retirement assets at fair value	9	8
Debt securities—Domestic government	3	3
Other post retirement benefit plan assets total	32	28
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Pension Plan assets:
Money market funds		0
Equity securities:
Domestic	166	150
International equity securities - defined benefit pension plan assets	185	166
Debt securities:
Domestic government and corporate credit	0	0
Corporate credit	14	8
Private equity funds	0	0
Defined Benefit Plan, Fair Value of Plan Assets	365	324
Other Postretirement Benefit Plans assets: [Abstract]
Money market funds	0	0
Domestic equity securities - Other postretirement benefit plan assets at fair value	8	8
International equity securities - other post retirement assets at fair value	9	8
Debt securities—Domestic government	3	3
Other post retirement benefit plan assets total	20	19
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Pension Plan assets:
Money market funds		1
Equity securities:
Domestic	19	15
International equity securities - defined benefit pension plan assets	0	0
Debt securities:
Domestic government and corporate credit	181	165
Corporate credit	0	0
Private equity funds	0	0
Defined Benefit Plan, Fair Value of Plan Assets	200	181
Other Postretirement Benefit Plans assets: [Abstract]
Money market funds	10	8
Domestic equity securities - Other postretirement benefit plan assets at fair value	2	1
International equity securities - other post retirement assets at fair value	0	0
Debt securities—Domestic government	0	0
Other post retirement benefit plan assets total	12	9
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Pension Plan assets:
Money market funds		0
Equity securities:
Domestic	0	0
International equity securities - defined benefit pension plan assets	0	0
Debt securities:
Domestic government and corporate credit	0	0
Corporate credit	0	0
Private equity funds	31	32
Defined Benefit Plan, Fair Value of Plan Assets	31	32
Other Postretirement Benefit Plans assets: [Abstract]
Money market funds	0	0
Domestic equity securities - Other postretirement benefit plan assets at fair value	0	0
International equity securities - other post retirement assets at fair value	0	0
Debt securities—Domestic government	0	0
Other post retirement benefit plan assets total	$ 0	$ 0