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, 2017
Dec. 31, 2016
Dec. 31, 2015
Pretax Roll Forward:      
Balance, beginning of year $ (316) $ (354) $ (347)
Net actuarial (loss) gain:      
Amounts arising during the year (16) 38 (25)
Amortization included in net periodic benefit costs 18 2 20
Prior service cost:      
Amounts arising during the year 0 0 0
Amortization included in net periodic benefit costs (2) (2) (2)
Balance, end of year (316) (316) (354)
Tax Roll Forward:      
Balance, beginning of year 111 124 121
Net actuarial (loss) gain:      
Amounts arising during the year 6 (13) 9
Amortization included in net periodic benefit costs (7) (1) (7)
Prior service cost:      
Amounts arising during the year 0 0 0
Amortization included in net periodic benefit costs 1 1 1
Balance, end of year 111 111 124
After-tax Roll Forward:      
Balance, beginning of year (205) (230) (226)
Net actuarial (loss) gain:      
Amounts arising during the year (10) 25 (16)
Amortization included in net periodic benefit costs 11 1 13
Prior service cost:      
Amounts arising during the year 0 0 0
Amortization included in net periodic benefit costs (1) (1) (1)
Balance, end of year (250) $ (205) $ (230)
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTaxCutsAndJobsActOf2017NetOfTax (47)    
OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTaxCutsAndJobsActsof2017NetOfTax $ 2