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Employee Benefits Schedule of Fair Value, Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Pension Plan assets:    
Money market funds $ 1 $ 3
Equity securities:    
Domestic 165 163
International equity securities - defined benefit pension plan assets 166 105
Debt securities:    
Domestic government and corporate credit 165 78
Corporate credit 8 76
Private equity funds 32 32
Alternative investments   30
Defined Benefit Plan, Fair Value of Plan Assets 537 487
Other Postretirement Benefit Plans assets: [Abstract]    
Money market funds 8 7
Domestic equity securities - Other postretirement benefit plan assets at fair value 9 13
International equity securities - other post retirement assets at fair value 8 4
Debt securities—Domestic government 3 3
Other post retirement benefit plan assets total 28 27
Fair Value, Inputs, Level 1 [Member]
    
Defined Benefit Pension Plan assets:    
Money market funds 0 0
Equity securities:    
Domestic 150 151
International equity securities - defined benefit pension plan assets 166 54
Debt securities:    
Domestic government and corporate credit 0 0
Corporate credit 8 76
Private equity funds 0 0
Alternative investments   0
Defined Benefit Plan, Fair Value of Plan Assets 324 281
Other Postretirement Benefit Plans assets: [Abstract]    
Money market funds 0 0
Domestic equity securities - Other postretirement benefit plan assets at fair value 8 12
International equity securities - other post retirement assets at fair value 8 2
Debt securities—Domestic government 3 3
Other post retirement benefit plan assets total 19 17
Fair Value, Inputs, Level 2 [Member]
    
Defined Benefit Pension Plan assets:    
Money market funds 1 3
Equity securities:    
Domestic 15 12
International equity securities - defined benefit pension plan assets 0 51
Debt securities:    
Domestic government and corporate credit 165 78
Corporate credit 0 0
Private equity funds 0 0
Alternative investments   0
Defined Benefit Plan, Fair Value of Plan Assets 181 144
Other Postretirement Benefit Plans assets: [Abstract]    
Money market funds 8 7
Domestic equity securities - Other postretirement benefit plan assets at fair value 1 1
International equity securities - other post retirement assets at fair value 0 2
Debt securities—Domestic government 0 0
Other post retirement benefit plan assets total 9 10
Fair Value, Inputs, Level 3 [Member]
    
Defined Benefit Pension Plan assets:    
Money market funds 0 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 32 32
Alternative investments   30
Defined Benefit Plan, Fair Value of Plan Assets 32 62
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