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Segment Information (Revenue and Property and Equipment, net by Geographic Area) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue $ 35,349 $ 33,633 $ 35,186 $ 32,641 $ 32,966 $ 31,821 $ 33,150 $ 32,039 $ 136,809 $ 129,976 $ 121,546
Property and equipment, net 2,487       1,879       2,487 1,879 1,796
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 132,526 125,006 116,864
Property and equipment, net 1,950       1,623       1,950 1,623 1,558
International                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 4,283 4,970 4,682
Property and equipment, net $ 537       $ 256       $ 537 $ 256 $ 238