Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Amounts Recognized in OCI (Details)

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BENEFIT PLANS - Amounts Recognized in OCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net actuarial (loss) gain:      
Amounts arising during the year $ (17) $ (5) $ (16)
Amortization included in net periodic benefit costs 12 13 18
Prior service cost:      
Amounts arising during the year 0    
Amortization included in net periodic benefit costs (2) (4) (2)
Net actuarial (loss) gain:      
Amounts arising during the year 5 2 6
Amortization included in net periodic benefit costs (3) (3) (7)
Prior service cost:      
Amounts arising during the year 0    
Amortization included in net periodic benefit costs 0 1 1
Net actuarial (loss) gain:      
Amounts arising during the year (12) (3) (10)
Amortization included in net periodic benefit costs 9 10 11
Prior service cost:      
Amounts arising during the year 0    
Amortization included in net periodic benefit costs (2) (3) (1)
Total recognized in OCI $ (251) $ (246) $ (250)