XML 187 R168.htm IDEA: XBRL DOCUMENT v3.22.0.1
Employee Benefit Plans (Summary of Changes in Pension and Other Postretirement Benefit Plans) (Detail) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Amounts recognized in the Consolidated Balance Sheets at December 31:          
Noncurrent pension and other postretirement benefit assets $ 1,704 $ 2,310 $ 1,704    
Noncurrent pension and other postretirement benefit liabilities (1,706) (442) (1,706)    
Pension Benefits          
Changes in benefit obligation:          
Benefit obligation at beginning of year   11,363 10,446    
Service cost   170 173 $ 162  
Interest cost   317 351 394  
Benefits paid   (488) (461)    
Actuarial (gains) losses during the year   (413) 992    
Settlements and curtailments [1]   59 138    
Benefit obligation at end of year 11,363 10,890 11,363 10,446  
Changes in fair value of plan assets:          
Fair value of plan assets at beginning of year   10,979 9,631    
Actual return (loss) on plan assets   1,202 1,602    
Employer contributions 250 284 278 520  
Benefits paid   (488) (461)    
Settlements [2]   (32) (71)    
Fair value of plan assets at end of year 10,979 11,945 10,979 9,631  
Funded status at end of year (384) 1,055 (384)    
Amounts recognized in the Consolidated Balance Sheets at December 31:          
Noncurrent pension and other postretirement benefit assets 1,054 1,246 1,054    
Other current liabilities (14) (12) (14)    
Noncurrent pension and other postretirement benefit liabilities (1,424) (179) (1,424)    
Net amount recognized $ (384) $ 1,055 $ (384)    
Significant assumptions used to determine benefit obligations as of December 31:          
Weighted average rate of increase for compensation 4.53% 4.51% 4.53%    
Pension Benefits | Minimum          
Significant assumptions used to determine benefit obligations as of December 31:          
Discount rate 2.73% 3.06% 2.73%   4.07%
Crediting interest rate for cash balance and similar plans 1.93% 1.81% 1.93%    
Crediting interest rate for cash balance and similar plans 1.93% 1.81% 1.93%    
Pension Benefits | Maximum          
Significant assumptions used to determine benefit obligations as of December 31:          
Discount rate 2.95% 3.19% 2.95%   4.10%
Crediting interest rate for cash balance and similar plans 2.15% 1.94% 2.15%    
Crediting interest rate for cash balance and similar plans 2.15% 1.94% 2.15%    
Other Postretirement Benefits          
Changes in benefit obligation:          
Benefit obligation at beginning of year   $ 1,746 $ 1,769    
Service cost   25 28 26  
Interest cost   46 58 68  
Benefits paid   (105) (120)    
Actuarial (gains) losses during the year   (161) 33    
Plan amendments   (14) (6)    
Settlements and curtailments [1]     16    
Benefit obligation at end of year $ 1,746 1,537 1,746 1,769  
Changes in fair value of plan assets:          
Fair value of plan assets at beginning of year   2,100 1,880    
Actual return (loss) on plan assets   294 300    
Employer contributions     13    
Benefits paid   (71) (93)    
Fair value of plan assets at end of year 2,100 2,323 2,100 $ 1,880  
Funded status at end of year 354 786 354    
Amounts recognized in the Consolidated Balance Sheets at December 31:          
Noncurrent pension and other postretirement benefit assets 650 1,064 650    
Other current liabilities (15) (15) (15)    
Noncurrent pension and other postretirement benefit liabilities (281) (263) (281)    
Net amount recognized $ 354 $ 786 $ 354    
Other Postretirement Benefits | Minimum          
Significant assumptions used to determine benefit obligations as of December 31:          
Discount rate 2.69% 3.04% 2.69%   4.05%
Other Postretirement Benefits | Maximum          
Significant assumptions used to determine benefit obligations as of December 31:          
Discount rate 2.80% 3.11% 2.80%   4.08%
[1] 2021 amounts include curtailments and settlements recognized primarily as a result of the employee choice program and settlements of nonqualified pension obligations. 2020 amounts include curtailment and settlements recognized as a result of the GT&S Transaction as well as settlements of qualified and nonqualified pension obligations.
[2] 2021 amounts relate to settlements of nonqualified pension obligations and 2020 amounts relate primarily to settlements of qualified and nonqualified pension obligations.