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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Subsequent Event [Line Items]      
Estimated aggregate dividend payment   $ 405 $ 416
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Dividends Payable, Date Declared Apr. 23, 2019    
Approved dividend, amount per share $ 0.44    
Estimated aggregate dividend payment $ 419    
Dividends Payable, Date to be Paid Jun. 13, 2019    
Dividends Payable, Date of Record May 07, 2019