XML 240 R159.htm IDEA: XBRL DOCUMENT v3.20.4
POST-RETIREMENT BENEFITS - Other Post-Retirement Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]    
Weighted average duration of defined benefit obligation 8 years 9 years
Estimate of contributions, Less than a year $ 4 $ 27
Estimate of contributions, between 1-2 years 4 7
Estimate of contributions, between 2-5 years 12 21
Estimate of contributions, over 5 years 36 98
Total 56 153
Defined pension benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Estimate of contributions, Less than a year 4 27
Estimate of contributions, between 1-2 years 4 7
Estimate of contributions, between 2-5 years 12 20
Estimate of contributions, over 5 years 36 95
Total 56 149
Other post-retirement benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Estimate of contributions, Less than a year 0 0
Estimate of contributions, between 1-2 years 0 0
Estimate of contributions, between 2-5 years 0 1
Estimate of contributions, over 5 years 0 3
Total $ 0 $ 4