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Income Taxes, Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other income tax disclosures      
Effect of unrecognized tax benefit on income tax expense $ 28 $ 26 $ 25
Interest expense and penalties related to unrecognized income tax benefits (1) 1 $ 3
Net accrued interest and penalties, total 15 $ 17  
Federal      
Operating loss carryforwards      
Deferred income tax asset for Federal NOL carryforwards (entities not on Federal return) $ 24    
Other income tax disclosures      
All audit periods prior to this year are closed 2013    
Federal | Minimum      
Operating loss carryforwards      
Expiration of NOL carryforwards Dec. 31, 2018    
Federal | Maximum      
Operating loss carryforwards      
Expiration of NOL carryforwards Dec. 31, 2036    
State      
Operating loss carryforwards      
NOL carryforwards $ 2,691    
Deferred income tax asset for State NOL carryforwards $ 121    
Other income tax disclosures      
All audit periods prior to this year are closed 2012    
State | Minimum      
Operating loss carryforwards      
Expiration of NOL carryforwards Dec. 31, 2017    
State | Maximum      
Operating loss carryforwards      
Expiration of NOL carryforwards Dec. 31, 2036