Income Taxes Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect, By Expiration Dates (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
2014 through 2018 [Member]
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]
United States state and local assets for income tax loss carryforwards - net of federal tax effect	$ 4
United States and local income tax credit carryforward - net of federal tax effect	11
2019 through 2023 [Member]
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]
United States state and local assets for income tax loss carryforwards - net of federal tax effect	15
United States and local income tax credit carryforward - net of federal tax effect	9
2024 through 2028 [Member]
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]
United States state and local assets for income tax loss carryforwards - net of federal tax effect	13
United States and local income tax credit carryforward - net of federal tax effect	7
2029 through 2033 [Member]
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]
United States state and local assets for income tax loss carryforwards - net of federal tax effect	5
United States and local income tax credit carryforward - net of federal tax effect	3
Not subject to expiration [Member]
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]
United States state and local assets for income tax loss carryforwards - net of federal tax effect	0
United States and local income tax credit carryforward - net of federal tax effect	6
Valuation allowance [Member]
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]
United States state and local assets for income tax loss carryforwards - net of federal tax effect	(15)
United States and local income tax credit carryforward - net of federal tax effect	$ (16)