Annual report [Section 13 and 15(d), not S-K Item 405]

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Fair Value Measurement of Plan Assets Using Unobservable Inputs (Details)

v3.25.4
COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Fair Value Measurement of Plan Assets Using Unobservable Inputs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year $ 43,396  
Actual Return on Assets:    
Fair value of plan assets at end of year 45,634 $ 43,396
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year 62 80
Actual Return on Assets:    
Assets held at end of year 2 0
Assets sold during the year 2 (8)
Purchases 60 38
Sales (14) (38)
Transfers Into (Out of) Level 3 (15) (10)
Fair value of plan assets at end of year 97 62
Level 3 | Corporate debt securities    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year 21 0
Actual Return on Assets:    
Assets held at end of year 0 (1)
Assets sold during the year 2 4
Purchases 55 38
Sales (6) (10)
Transfers Into (Out of) Level 3 (15) (10)
Fair value of plan assets at end of year 57 21
Level 3 | Alternative and Other Investments    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at beginning of year 41 80
Actual Return on Assets:    
Assets held at end of year 2 1
Assets sold during the year 0 (12)
Purchases 5 0
Sales (8) (28)
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year $ 40 $ 41