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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes              
Provision for tax at statutory rate (as a percent)         21.00% 35.00% 35.00%
Foreign subsidiary dividends received deduction percentage         100.00%    
Incremental tax expense related to TCJA $ 1 $ 2          
Provisional TCJA impact, One-time transition tax           $ 21  
Final TCJA impact, One-time transition tax   4     $ 25    
Provisional TCJA impact, Remeasurement of deferred tax assets and liabilities           (38)  
Final TCJA impact, Remeasurement of deferred tax assets and liabilities         (38)    
Provisional TCJA impact, Net impact of provision for taxes on unremitted earnings       $ 2   33  
Final TCJA impact, Net impact of provision for taxes on unremitted earnings         35    
Provisional TCJA impact, Other items, net       $ (3)   7  
Final TCJA impact, Other items, net         4    
Provisional TCJA impact, Net impact of the TCJA $ 1 $ 2 $ 23     $ 23  
Final TCJA impact, Net impact of the TCJA         $ 26    
Net impact of transition tax   0.60%     0.60% 2.70%  
Net impact of U.S. deferred tax remeasurement     (4.90%)     (4.90%)  
Net impact of provision for taxes on unremitted earnings     4.30% 0.30% 0.30% 4.30% 0.50%
TCJA other items, net percentage       0.40%   0.90%