Note 12 - Hedging Activities - Undesignated Hedges (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Gross notional value for translated earning contracts		$ 14,674	$ 14,740
Average Rate Forward Contracts, Japanese Yen-denominated [Member] | Not Designated as Hedging Instrument [Member]
Gross notional value for translated earning contracts		4,100	4,500
Average Rate Forward Contracts, South Korean Won-denominated [Member] | Not Designated as Hedging Instrument [Member]
Gross notional value for translated earning contracts		300	400
Average Rate Forward Contracts, Euro-denominated [Member] | Not Designated as Hedging Instrument [Member]
Gross notional value for translated earning contracts		400	500
Average Rate Forward Contracts, Other Foreign Currencies [Member] | Not Designated as Hedging Instrument [Member]
Gross notional value for translated earning contracts	[1]	100	100
Options Contracts, Japanese Yen-denominated [Member] | Not Designated as Hedging Instrument [Member]
Gross notional value for translated earning contracts	[2]	1,800	2,000
Options Contracts, Other Foreign Currencies [Member] | Not Designated as Hedging Instrument [Member]
Gross notional value for translated earning contracts	[3]	1,400
Translated Earnings Contracts [Member]
Gross notional value for translated earning contracts		8,100	7,500
Translated Earnings Contracts [Member] | Not Designated as Hedging Instrument [Member]
Gross notional value for translated earning contracts		$ 8,124	$ 7,453

[1] Other foreign currencies denominated average rate forward contracts include Chinese yuan, new Taiwan dollar and British pound.

[2] Japanese yen-denominated options contracts include zero-cost collars, purchased call options and put options. With respect to the zero-cost collars, the gross notional amount includes the value of both the put and call options. However, due to the nature of the zero-cost collars, only the put or the call option can be exercised at maturity.

[3] Other foreign currencies denominated options contracts are purchased basket options that include a basket of underlying currencies (i.e. Japanese yen, South Korean won, Chinese yuan, euro and British pound), and each basket option will be net settled against USD.