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Note 2 - Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 960	$ 1,799	$ 831
Total cash, cash equivalents, and restricted cash equivalents shown on the Statement of Cash Flows:	983	1,818	856
Other Current Assets [Member]
Restricted cash equivalents	19	7	13
Other Noncurrent Assets [Member]
Restricted cash equivalents	$ 4	$ 12	$ 12

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