Note 6 - Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Income (AOCI) of the Parent (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance		$ 1,870	$ 1,880	$ 1,834	$ 1,968
Other comprehensive income		39	21	20	(101)
Balance		1,939	1,720	1,939	1,720
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance		(806)	(857)	(802)	(714)
Currency translation adjustments		17	2	13	(141)
Other comprehensive income		17	2	13	(141)
Balance		(789)	(855)	(789)	(855)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance		(8)	(1)	9	(30)
Holding gains and losses		(4)	(17)	28	22
Reclassification of amount to net income	[1]	23	27	(27)	16
Tax (expense) benefit		(3)		(2)	1
Other comprehensive income		16	10	(1)	39
Balance		8	9	8	9
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance		(230)	(240)	(233)	(243)
Reclassification adjustment for net actuarial losses included in net periodic benefit cost (b)	[2]	5	5	9	10
Tax (expense) benefit		(1)	(1)	(2)	(3)
Other comprehensive income		4	4	7	7
Balance		(226)	(236)	(226)	(236)
AOCI Attributable to Parent [Member]
Balance		(1,044)	(1,098)	(1,026)	(987)
Currency translation adjustments		17	2	13	(141)
Holding gains and losses		(4)	(17)	28	22
Reclassification of amount to net income	[1]	23	27	(27)	16
Reclassification adjustment for net actuarial losses included in net periodic benefit cost (b)	[2]	5	5	9	10
Tax (expense) benefit		(4)	(1)	(4)	(2)
Other comprehensive income		37	16	19	(95)
Balance		$ (1,007)	$ (1,082)	$ (1,007)	$ (1,082)

[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.