XML 112 R66.htm IDEA: XBRL DOCUMENT v3.10.0.1
Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax [Line Items]      
Income tax benefit, adjustment $ 4    
Other income tax disclosures      
Effect of unrecognized tax benefit on income tax expense 39 $ 37 $ 28
Interest expense and penalties related to unrecognized income tax benefits 1 3 $ (1)
Net accrued interest and penalties, total 19 $ 19  
State      
Operating loss carryforwards      
NOL carryforwards 2,843    
Deferred income tax asset for State NOL carryforwards 146    
Federal      
Operating loss carryforwards      
Deferred income tax asset for Federal NOL carryforwards (entities not on Federal return) $ 13