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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Income Tax Footnote Disclosure [Line Items]          
Deferred Tax Assets, Net of Valuation Allowance $ 630   $ 630   $ 1,170
Deferred Tax Assets, Net 1,800   1,800    
Deferred Tax Assets, Valuation Allowance 200   $ 200   100
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 100        
Gross unrecognized tax benefits         $ 90
Operating Loss Carryforward, Term     7 years    
Effective tax rates (201.00%) 7.60% (216.00%) 7.90%  
United States statutory tax rate     21.00%    
Decrease in Unrecognized Tax Benefits is Reasonably Possible $ 10   $ 10    
Pro Forma [Member]          
Income Tax Footnote Disclosure [Line Items]          
Effective tax rates 12.70%   13.60%