Leases - Schedule of Operating ROU Assets and Lease Liabilities (Details) $ in Millions	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Total lease liabilities	$ 276
Other assets
Lessee, Lease, Description [Line Items]
ROU assets	238
Accrued expenses and other current liabilities
Lessee, Lease, Description [Line Items]
Current lease liabilities	61
Other liabilities
Lessee, Lease, Description [Line Items]
Non-current lease liabilities	$ 215