Income Taxes (Details 3) $ in Millions	Dec. 31, 2015 USD ($)
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	$ 2,362
2016
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	1
2017
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	11
2018
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	8
2019
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	10
2020
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	80
2021
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	75
2022
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	21
2023-2035
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	52
Do not expire
Gross Net Operating Loss Carryforwards [Abstract]
Gross carryforwards related to net operating losses	$ 2,104