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Income Taxes Unrecognized Tax Benefits (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]            
Required minimum likelihood for benefits to be recognized in the financial statements       50.00%    
Balance at beginning of year $ 122,000,000 $ 148,000,000 $ 189,000,000      
Additions based on current year tax positions 3,000,000 3,000,000 4,000,000      
Additions based on prior year tax positions 0 7,000,000 0      
Reductions based on prior year tax positions 0 (1,000,000) (6,000,000)      
Reductions based on settlements with taxing authority (22,000,000) (26,000,000) (25,000,000)      
Reductions due to lapse in statute of limitations (2,000,000) (9,000,000) (14,000,000)      
Impact of the 2017 Tax Reform (4,000,000) 0 0      
Balance at end of year 97,000,000 122,000,000 148,000,000      
Unrecognized Tax Benefits,Other Disclosure [Abstract]            
Income Tax Examination, Penalties and Interest Expense (9,000,000) 2,000,000 (4,000,000)      
Income Tax Examination, Interest Accrued       $ 19,000,000 $ 28,000,000 $ 24,000,000
Income Tax Examination, Penalties Accrued       0 0 2,000,000
Unrecognized Tax Benefits $ 122,000,000 $ 148,000,000 $ 189,000,000 97,000,000 $ 122,000,000 $ 148,000,000
Increase in Unrecognized Tax Benefits is Reasonably Possible       6,000,000    
Unrecognized tax benefits balance reasonably possible next year       $ 91,000,000