Supplemental Cash Flow Statement Disclosures (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2022	Jan. 01, 2021
Cash, Cash Equivalents and Restricted Cash
Cash and cash equivalents	$ 437	$ 461	$ 563	$ 1,366
Current restricted cash	$ 9	$ 10	$ 16	$ 15
Location of current restricted cash	Other current assets	Other current assets	Other current assets	Other current assets
Total cash, cash equivalents and restricted cash	$ 446	$ 471	$ 579	$ 1,381	$ 579	$ 1,381
Other Non-cash items
PP&E acquired but not yet paid	$ 528	$ 515	$ 540	$ 409

Future cash outflow to pay for purchases of fixed assets that have occurred.

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