Leases - Balance Sheet Disclosure (Details) $ in Millions	Dec. 31, 2019 USD ($)
Assets
Total lease assets	$ 367
Liabilities
Total lease liabilities	387	[1],[2]
Other assets
Assets
Operating lease assets	344
Property and equipment, net
Assets
Finance lease assets	23
Accounts payable and accrued liabilities
Liabilities
Current operating lease liabilities	109
Other long-term liabilities
Liabilities
Noncurrent operating lease liabilities	251
Current portion of long-term debt and finance lease obligations
Liabilities
Current finance lease liabilities	7
Long-term debt and finance lease obligations
Liabilities
Noncurrent finance lease liabilities	$ 20

[1] Lease payments recognized as part of lease liabilities for optional renewal periods are insignificant.

[2] Total lease payments exclude approximately $350 million of contractual minimum lease payments for leases executed but not yet commenced. These leases will commence in 2020 with lease terms of approximately 11 years.