Leases - Balance Sheet Disclosure (Details) - USD ($) $ in Millions	Dec. 31, 2021		Dec. 31, 2020
Assets
Operating lease assets	$ 762		$ 895
Finance lease assets	33		27
Total lease assets	$ 795		$ 922
Operating Lease assets balance sheet caption	Other assets		Other assets
Finance lease assets balance sheet caption	Property and equipment, net		Property and equipment, net
Liabilities
Current operating lease liabilities	$ 178		$ 175
Noncurrent operating lease liabilities	713		832
Current finance lease liabilities	9		8
Noncurrent finance lease liabilities	25		21
Total lease liabilities	$ 925	[1]	$ 1,036
Current operating lease liabilities balance sheet caption	Accounts payable and accrued liabilities		Accounts payable and accrued liabilities
Noncurrent operating lease liabilities balance sheet caption	Other long-term liabilities		Other long-term liabilities
Current finance lease liabilities balance sheet caption	Current portion of long-term debt and finance lease obligations		Current portion of long-term debt and finance lease obligations
Noncurrent finance lease liabilities balance sheet caption	Long-term debt and finance lease obligations		Long-term debt and finance lease obligations

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