Balance Sheet Components Pension and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 4
Interest cost	9	8
Expected return on plan assets	(10)	(10)
Amortization of net actuarial loss	4	6
Net periodic benefit cost	7	8
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	1	1
Expected return on plan assets	0	0
Amortization of net actuarial loss	0	0
Net periodic benefit cost	$ 1	$ 2