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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Balance		$ 1,720	$ 1,814	$ 1,968	$ 1,442
Other comprehensive income (loss)		19	(33)	(82)	364
Balance		1,793	1,878	1,793	1,878
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance		(855)	(694)	(714)	(721)
Other comprehensive income (loss) before reclassification		7	(39)	(134)	(12)
Tax (expense) benefit
Other comprehensive income (loss)		7	(39)	(134)	(12)
Balance		(848)	(733)	(848)	(733)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance		9	(47)	(30)	(54)
Other comprehensive income (loss) before reclassification		(51)	57	(29)	77
Reclassification of amount to net income	[1]	52	(49)	68	(62)
Tax (expense) benefit				1
Other comprehensive income (loss)		1	8	40	15
Balance		10	(39)	10	(39)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance		(236)	(227)	(243)	(587)
Reclassification of amount to net income	[2]	5	6	15	282
Tax (expense) benefit		(1)	(1)	(4)	(21)
Other comprehensive income (loss)		4	5	11	365
Net actuarial gains					104
Balance		(232)	(222)	(232)	(222)
AOCI Attributable to Parent [Member]
Balance		(1,082)	(968)	(987)	(1,362)
Tax (expense) benefit		(1)	(1)	(3)	(21)
Other comprehensive income (loss)		12	(26)	(83)	368
Net actuarial gains					104
Balance		$ (1,070)	$ (994)	$ (1,070)	$ (994)

[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.