Note 6 - Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Income (AOCI) of the Parent (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Balance		$ 1,968	$ 1,442
Other comprehensive income (loss)		(122)	37
Balance		1,860	1,539
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance		(714)	(721)
Other comprehensive income (loss) before reclassification		(143)	24
Other comprehensive income (loss)		(143)	24
Balance		(857)	(697)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance		(30)	(54)
Other comprehensive income (loss) before reclassification		39	29
Reclassification of amount to net income	[1]	(11)	(24)
Tax (expense) benefit		1
Other comprehensive income (loss)		29	5
Balance		(1)	(49)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance		(243)	(587)
Reclassification of amount to net income	[2]	5	7
Tax (expense) benefit		(2)	(2)
Other comprehensive income (loss)		3	5
Balance		(240)	(582)
AOCI Attributable to Parent [Member]
Balance		(987)	(1,362)
Tax (expense) benefit		(1)	(2)
Other comprehensive income (loss)		(111)	34
Balance		$ (1,098)	$ (1,328)

[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.