Balance Sheet Components Pension and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 4	$ 7	$ 8
Interest cost	8	8	17	16
Expected return on plan assets	(10)	(10)	(20)	(20)
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)	0	0	0	0
Amortization of net actuarial loss	5	6	9	12
Net periodic benefit cost	6	8	13	16
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	0	1	1
Interest cost	1	1	2	2
Expected return on plan assets	(1)	(1)	(1)	(1)
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)	1	1	1	1
Amortization of net actuarial loss	0	0	0	0
Net periodic benefit cost	2	1	3	3
Non Qualified Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	1	1	1	1
Expected return on plan assets	0	0	0	0
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)	0	0	0	0
Amortization of net actuarial loss	0	0	0	0
Net periodic benefit cost	$ 1	$ 1	$ 1	$ 1