Note 6 - Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Income (AOCI) of the Parent (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance		$ 1,939	$ 1,720	$ 1,834	$ 1,968
Other comprehensive income (loss)		(30)	19	(10)	(82)
Balance		1,912	1,793	1,912	1,793
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance		(789)	(855)	(802)	(714)
Currency translation adjustments		(23)	7	(10)	(134)
Other comprehensive income (loss)		(23)	7	(10)	(134)
Balance		(812)	(848)	(812)	(848)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance		8	9	9	(30)
Holding gains and losses		15	(51)	43	(29)
Reclassification of amount to net income	[1]	(24)	52	(51)	68
Tax (expense) benefit				(2)	1
Other comprehensive income (loss)		(9)	1	(10)	40
Balance		(1)	10	(1)	10
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance		(226)	(236)	(233)	(243)
Reclassification adjustment for net actuarial losses included in net periodic benefit cost (b)	[2]	5	5	14	15
Tax (expense) benefit		(1)	(1)	(3)	(4)
Other comprehensive income (loss)		4	4	11	11
Balance		(222)	(232)	(222)	(232)
AOCI Attributable to Parent [Member]
Balance		(1,007)	(1,082)	(1,026)	(987)
Currency translation adjustments		(23)	7	(10)	(134)
Holding gains and losses		15	(51)	43	(29)
Reclassification of amount to net income	[1]	(24)	52	(51)	68
Reclassification adjustment for net actuarial losses included in net periodic benefit cost (b)	[2]	5	5	14	15
Tax (expense) benefit		(1)	(1)	(5)	(3)
Other comprehensive income (loss)		(28)	12	(9)	(83)
Balance		$ (1,035)	$ (1,070)	$ (1,035)	$ (1,070)

[1] Realized gains and losses from currency-related forward contracts associated with forecasted transactions or from other derivative instruments treated as cash flow hedges are reclassified from AOCI into the same line item in the consolidated statement of operations in which the underlying forecasted transaction or other hedged item is recorded. See Note 13 for additional details.

[2] See Note 10 for additional details.