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Stockholders' Equity (Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive income (loss), net of tax $ 2 $ (95) $ 5 $ 85
(Losses) gains on securities        
Accumulated Other Comprehensive Income Loss [Line Items]        
Unrealized (losses) gains, before tax   (122)   161
Other comprehensive (loss) income, before tax   (122)   161
Unrealized (losses) gains, tax benefit (provision)   29   (77)
Other comprehensive (loss) income, tax benefit (provision)   29   (77)
Unrealized (losses) gains, net of tax   (93)   84
Other comprehensive income (loss), net of tax   $ (93)   $ 84