Note 11 - Debt - Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Total long-term debt, including current portion	$ 6,911	$ 7,044
Less current portion of long-term debt	224	55
Long-term debt	6,687	6,989
Medium-Term Notes, Average Rate 7.66%, Due Through 2023 [Member]
Debentures	45	45
Debentures, 6.85%, Due 2029 [Member]
Debentures	159	160
Debentures, Callable, 7.25%, Due 2036 [Member]
Debentures	249	249
Debentures, 4.70%, Due 2037 [Member]
Debentures	296	296
Debentures, 5.75%, Due 2040 [Member]
Debentures	396	396
Debentures, 4.75%, Due 2042 [Member]
Debentures	496	496
Debentures, 5.35%, due 2048 [Member]
Debentures	544	544
Debentures 3.9 Due 2049 [Member]
Debentures	395	395
Debentures, 4.375%, due 2057 [Member]
Debentures	743	743
Debentures, 5.85%, due 2068 [Member]
Debentures	297	297
Debentures 5.45 Due 2079 [Member]
Debentures	1,086	1,086
Yen-denominated Debentures, 0.698%, due 2024 [Member]
Debentures	160	182
Yen-denominated Debentures, 0.722%, due 2025 [Member]
Debentures	76	87
Yen-denominated Debentures, .992%, due 2027 [Member]
Debentures	358	407
Yen-denominated Debentures, 1.043%, due 2028 [Member]
Debentures	232	264
Yen-denominated Debentures, 1.219%, due 2030 [Member]
Debentures	190	216
Yen Denominated Debentures, 1.153 Due 2031 [Member]
Debentures	237	270
Yen-denominated Debentures, 1.583%, due 2037 [Member]
Debentures	76	86
Yen Denominated Debentures, 1.513 Due 2039 [Member]
Debentures	45	51
Financing Leases, Average Discount Rate 4.4%, Due Through 2044 [Member]
Debentures	190	183
Other, Average Rate 3.93%, Due Through 2043 [Member]
Debentures	$ 641	$ 591