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Leases - Balance Sheet Classification of Lease Assets and Liabilities (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Leases [Abstract]  
Operating lease assets $ 361
Finance lease assets 24
Total lease assets 385
Current operating lease liabilities 74
Current finance lease liabilities 7
Noncurrent operating lease liabilities 327
Noncurrent finance lease liabilities 11
Total lease liabilities 419
Operating lease assets, net of accumulated amortization 39
Finance lease assets, net of accumulated amortization $ 10