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Income Taxes (Details 3)
$ in Millions
Dec. 31, 2016
USD ($)
Operating and capital loss carryforwards [Line Items]  
Amount of operating and capital loss carryforwards due to expire in 2016 $ 27
Amount of operating and capital loss carryforwards due to expire between 2017 and 2020 674
Amount of operating and capital loss carryforwards due to expire between 2021 and 2035 1,221
Amount of operating and capital loss carryforwards which may be carried forward indefinitely 321
Total Operating and Capital Loss Carryforwards 2,243
Foreign [Member]  
Operating and capital loss carryforwards [Line Items]  
Amount of operating and capital loss carryforwards due to expire in 2016 20
Amount of operating and capital loss carryforwards due to expire between 2017 and 2020 53
Amount of operating and capital loss carryforwards due to expire between 2021 and 2035 93
Amount of operating and capital loss carryforwards which may be carried forward indefinitely 321
Total Operating and Capital Loss Carryforwards 487
U.S. state [Member]  
Operating and capital loss carryforwards [Line Items]  
Amount of operating and capital loss carryforwards due to expire in 2016 7
Amount of operating and capital loss carryforwards due to expire between 2017 and 2020 97
Amount of operating and capital loss carryforwards due to expire between 2021 and 2035 908
Amount of operating and capital loss carryforwards which may be carried forward indefinitely 0
Total Operating and Capital Loss Carryforwards 1,012
U.S. federal [Member]  
Operating and capital loss carryforwards [Line Items]  
Amount of operating and capital loss carryforwards due to expire in 2016 0
Amount of operating and capital loss carryforwards due to expire between 2017 and 2020 524
Amount of operating and capital loss carryforwards due to expire between 2021 and 2035 220
Amount of operating and capital loss carryforwards which may be carried forward indefinitely 0
Total Operating and Capital Loss Carryforwards $ 744