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Income Taxes Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits as of January 1 $ 0 $ 213 $ 514
Gross decreases- tax positions in prior years 0 (213) (301)
Unrecognized tax benefits as of December 31 0 0 213
Unrecognized Tax Benefit Resulting in Tax Credits and/or Net Operating Loss Carryforward $ 0 $ 0 $ 91