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Balance Sheet Components Pension and Other Postretirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Pension Plans, Defined Benefit [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 4 $ 3
Interest cost 8 8
Expected return on plan assets (10) (10)
Amortization of net actuarial loss 6 4
Net periodic benefit cost 8 5
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 1 1
Expected return on plan assets 0 0
Amortization of net actuarial loss 0 0
Net periodic benefit cost 2 2
Non Qualified Benefit Plans [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 0 1
Expected return on plan assets 0 0
Amortization of net actuarial loss 0 0
Net periodic benefit cost $ 0 $ 1