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Income Taxes - Tax Effected Operating Loss, Capital Loss, and Tax Credit Carryovers (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income tax                
Net UTB impacting the effective tax rate $ 584,000,000     $ 526,000,000   $ 584,000,000   $ 526,000,000
Interest and penalties related to unrecognized tax benefits, expense (benefit) recognized on a gross basis 5,000,000       $ 8,000,000 8,000,000 $ 16,000,000  
Interest and penalties related to unrecognized tax benefits, accrued on a gross basis 65,000,000     68,000,000   65,000,000   68,000,000
Deferred tax assets valuation allowance $ 73,000,000     81,000,000   $ 73,000,000   $ 81,000,000
Effective tax rate (as a percent) 21.30%       28.30% 24.00% 26.10%  
Increase (decrease) in effective income tax rate from prior reporting period to current reporting period (as a percent) (7.00%)         (2.10%)    
Statutory U.S. tax rate           21.00%   35.00%
Provisional income tax expense (benefit) from enactment of Tax Cuts and Jobs Act of 2017       762,000,000        
Tax Cuts and Jobs Act of 2017 measurement period adjustment $ 0 $ 0 $ 217,000,000          
Provisional transition tax expense (benefit) for accumulated foreign earnings from enactment of Tax Cuts and Jobs Act of 2017 0 0 132,000,000 745,000,000        
Provisional expense (benefit) from remeasurement of deferred tax assets and liabilities due to change in tax rate from enactment of Tax Cuts and Jobs Act of 2017 0 $ 0 $ 85,000,000 $ 17,000,000        
Period of time over which TCJA transition tax on certain unrepatriated earnings of foreign subsidiaries may be paid           8 years    
Tax Cuts and Jobs Act of 2017 transition tax in current accrued income taxes payable 74,000,000         $ 74,000,000    
Tax Cuts and Jobs Act of 2017 transition tax long term income taxes payable $ 733,000,000         $ 733,000,000