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Note 2 - Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
Millions |  | 2022 |  |  | 2021 |  |  | 2020 |
Cash and cash equivalents |  | $ | 973 |  |  | $ | 960 |  |  | $ | 1,799 |
Restricted cash equivalents in other current assets |  |  | 10 |  |  |  | 19 |  |  |  | 7 |
Restricted cash equivalents in other assets |  |  | 4 |  |  |  | 4 |  |  |  | 12 |
Total cash, cash equivalents, and restricted cash equivalents | $ | 987 |  |  | $ | 983 |  |  | $ | 1,818 |

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