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Balance Sheet Components Pension and Other Postretirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Pension Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4 $ 4 $ 11 $ 12
Interest cost 8 7 25 23
Expected return on plan assets (9) (10) (29) (30)
Amortization of prior service cost     0 0
Amortization of net actuarial loss 4 6 13 18
Net periodic benefit cost 7 7 20 23
Other Postretirement Benefit Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 1 2
Interest cost 1 1 3 3
Expected return on plan assets 0 0 (1) (1)
Amortization of prior service cost     1 1
Amortization of net actuarial loss 0 0 0 0
Net periodic benefit cost 1 2 4 5
Non Qualified Benefit Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 0 0 1 1
Expected return on plan assets 0 0 0 0
Amortization of prior service cost     0 0
Amortization of net actuarial loss 0 0 0 0
Net periodic benefit cost $ 0 $ 0 $ 1 $ 1