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Income Taxes Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]            
Balance at beginning of period $ 97 $ 122 $ 148      
Additions based on current year tax positions 3 3 3      
Additions based on prior year tax positions 7 0 7      
Reductions based on prior year tax positions 0 0 (1)      
Reductions based on settlements with taxing authority (73) (22) (26)      
Reductions due to lapse in statute of limitations 0 (2) (9)      
Impact of the 2017 Tax Reform 0 (4) 0      
Balance at end of period 34 97 122      
Unrecognized Tax Benefits,Other Disclosure [Abstract]            
Income Tax Examination, Penalties and Interest Expense (Benefit) (15) (9) 2      
Income Tax Examination, Interest Accrued       $ 2 $ 19 $ 28
Income Tax Examination, Penalties Accrued       1 0  
Unrecognized Tax Benefits $ 97 $ 122 $ 148 34 $ 97 $ 122
Decrease in Unrecognized Tax Benefits is Reasonably Possible       21    
Unrecognized tax benefits balance reasonably possible next year       $ 13