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POSTRETIREMENT BENEFIT PLANS (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Effect on Operations of Pension Plans
Principal pension plans
Three months ended June 30
 
Six months ended June 30
(In millions)
2020

2019

 
2020

2019

Service cost for benefits earned
$
192

$
160

 
$
345

$
318

Prior service cost amortization
37

34

 
74

67

Expected return on plan assets
(748
)
(862
)
 
(1,496
)
(1,725
)
Interest cost on benefit obligations
589

723

 
1,176

1,449

Net actuarial loss amortization
851

770

 
1,699

1,533

Curtailment/settlement loss (gain)


 

51

Benefit plans cost
$
921

$
825

 
$
1,798

$
1,693