Leases - Supplemental Balance Sheet Information (Details) $ in Millions	Sep. 30, 2019 USD ($)
ROU assets
Other assets	$ 69
Lease liabilities
Accounts payable and accrued liabilities (current)	28
Other long-term liabilities (non-current)	49
Total operating lease liabilities	77
ROU assets
Property, equipment, and capitalized software, net	233
Lease liabilities
Accounts payable and accrued liabilities (current)	8
Finance lease liabilities (non-current)	233
Total finance lease liabilities	$ 241