v3.3.1.900
Income Taxes Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect, By Expiration Dates (Details) - United States - State and local - Domestic Tax Authority [Member]
$ in Millions
Dec. 31, 2015
USD ($)
2036 through 2040 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States state and local deferred income tax assets for income tax loss carryforwards - net of federal tax $ 0
United States and local income tax credit carryforwards - net of federal tax effect 5
2031 through 2035 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States state and local deferred income tax assets for income tax loss carryforwards - net of federal tax 9
United States and local income tax credit carryforwards - net of federal tax effect 3
2026 through 2030 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States state and local deferred income tax assets for income tax loss carryforwards - net of federal tax 12
United States and local income tax credit carryforwards - net of federal tax effect 6
2021 through 2025 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States state and local deferred income tax assets for income tax loss carryforwards - net of federal tax 17
United States and local income tax credit carryforwards - net of federal tax effect 10
2016 through 2020 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States state and local deferred income tax assets for income tax loss carryforwards - net of federal tax 7
United States and local income tax credit carryforwards - net of federal tax effect 10
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 deferred income tax assets for income tax loss carryforwards - net of federal tax 0
United States and local income tax credit carryforwards - net of federal tax effect 0
Related 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 deferred income tax assets for income tax loss carryforwards - net of federal tax (18)
United States and local income tax credit carryforwards - net of federal tax effect (16)
Related valuation allowance [Member] | After ASU 2013-11 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States federal income tax loss carryforwards (18)
United States and local income tax credit carryforwards - net of federal tax effect (16)
2016 through 2020 [Member] | After ASU 2013-11 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States federal income tax loss carryforwards 0
United States and local income tax credit carryforwards - net of federal tax effect 8
2021 through 2025 [Member] | After ASU 2013-11 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States federal income tax loss carryforwards 12
United States and local income tax credit carryforwards - net of federal tax effect 9
2026 through 2030 [Member] | After ASU 2013-11 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States federal income tax loss carryforwards 12
United States and local income tax credit carryforwards - net of federal tax effect 6
2031 through 2035 [Member] | After ASU 2013-11 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States federal income tax loss carryforwards 9
United States and local income tax credit carryforwards - net of federal tax effect 2
2036 through 2040 [Member] | After ASU 2013-11 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States federal income tax loss carryforwards 0
United States and local income tax credit carryforwards - net of federal tax effect 5
Not subject to expiration [Member] | After ASU 2013-11 [Member]  
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items]  
United States federal income tax loss carryforwards 0
United States and local income tax credit carryforwards - net of federal tax effect $ 0