Note 19 - Share-based Compensation (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	39,000
Share-based Payment Arrangement, Expense	$ 190	$ 207	$ 56
Proceeds and Excess Tax Benefit from Share-based Compensation	$ 37	12	9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	6,573
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0
Proceeds from Stock Options Exercised	$ 97	124	58
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	$ 9	$ 23	$ 13
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)		$ 3.67	$ 8.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 16	$ 31	$ 10
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 10
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 3 months 18 days
Share-based Payment Arrangement, Expense, Tax Benefit	$ 15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 100	99	47
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	5 years
In-the-money Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	7,000
Restricted Stock and Restricted Stock Units [Member]
Share-based Payment Arrangement, Expense	$ 94	95	43
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 117
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 88	38	$ 33
Restricted Stock and Restricted Stock Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	1 year
Restricted Stock and Restricted Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Performance-based Restricted Stock Units [Member]
Share-based Payment Arrangement, Expense	$ 79	$ 81
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 30
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 4 months 24 days