Leases - Schedule of Supplemental Balance Sheet Information (Details) $ in Millions	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 998
Other current liabilities	249
Other long-term liabilities	715
Total operating lease liabilities	964
Finance lease right-of-use assets	113
Current portion of long-term debt	22
Long-term debt	110
Total finance lease liabilities	$ 132