XML 80 R56.htm IDEA: XBRL DOCUMENT v3.22.0.1
Note 5 - Pension and Other Postretirement Benefits - Changes in PBO and Plan Assets (Details) - Pension Plan [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Projected benefit obligation at beginning of year $ 5,658 $ 4,847  
Service cost 110 91 $ 80
Interest cost 104 137 160
Actuarial (gain)/loss (346) 812  
Gross benefits paid (230) (229)  
Projected benefit obligation at end of year 5,296 5,658 4,847
Fair value of plan assets at beginning of year 5,016 4,528  
Actual (loss)/return on plan assets 737 686  
Non-qualified plan benefit contributions 31 31  
Fair value of plan assets at end of year 5,554 5,016 $ 4,528
Funded status at end of year $ 258 $ (642)