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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Balance		$ 1,880	$ 1,539	$ 1,968	$ 1,442
Other comprehensive income (loss)		21	360	(101)	397
Balance		1,720	1,814	1,720	1,814
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance		(857)	(697)	(714)	(721)
Other comprehensive income (loss) before reclassification		2	3	(141)	27
Tax (expense) benefit
Other comprehensive income (loss)		2	3	(141)	27
Balance		(855)	(694)	(855)	(694)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance		(1)	(49)	(30)	(54)
Other comprehensive income (loss) before reclassification		(17)	(9)	22	20
Reclassification of amount to net income	[1]	27	11	16	(13)
Tax (expense) benefit				1
Other comprehensive income (loss)		10	2	39	7
Balance		9	(47)	9	(47)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance		(240)	(582)	(243)	(587)
Reclassification of amount to net income	[2]	5	269	10	276
Tax (expense) benefit		(1)	(18)	(3)	(20)
Other comprehensive income (loss)		4	355	7	360
Net actuarial gains			104		104
Balance		(236)	(227)	(236)	(227)
AOCI Attributable to Parent [Member]
Balance		(1,098)	(1,328)	(987)	(1,362)
Tax (expense) benefit		(1)	(18)	(2)	(20)
Other comprehensive income (loss)		16	360	(95)	394
Net actuarial gains			104		104
Balance		$ (1,082)	$ (968)	$ (1,082)	$ (968)

[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 12 for additional details.

[2] See Note 10 for additional details.