Supplemental Cash Flow Information (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Supplemental Cash Flow Information [Line Items]
Cash payments related to operating lease liabilities	[1]	$ 278	$ 274
Interest Paid		324	344
Income Taxes Paid		9	13
New ROU assets obtained in exchange for operating lease liabilities		155	324
Increase (decrease) in accounts payable for purchases of property and equipment		(7)	(16)
Purchase of property and equipment under capital leases and installment purchases		10	23
Reconciliation of cash, cash equivalents and restricted cash [Line Items]
Cash and cash equivalents		281		$ 292
Restricted cash, current		160		169
Restricted Cash, Noncurrent		5		5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		$ 446	$ 525	$ 466	$ 381

[1] Excludes the Company's contingent payments pursuant to operating leases, which are recorded as expense in the period such contingencies are resolved.