PENSION BENEFITS - Projected Benefit Obligation and Accumulated Benefit Obligation (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Plan with ABO in Excess of Plan Assets
PBO	$ 1,529	$ 1,420
ABO	1,520	1,290
Fair value of plan assets at end of year	1,130	954
Plans with Plan Assets in Excess of ABO
PBO	26	22
ABO	21	18
Fair value of plan assets at end of year	22	22
Total
PBO	1,555	1,442	$ 1,604
ABO	1,541	1,308
Fair value of plan assets at end of year	$ 1,152	$ 976	$ 1,074

Defined Benefit Plan, Fair Value of Plan Assets [Abstract]

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Defined Benefit Plan, Pension Plan With Plant Assets In Excess of Accumulated Benefit Obligation, Accumulated Benefit Obligation

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Defined Benefit Plan, Plans With Plan Assets In Excess Of Accumulated Benefit Obligations [Abstract]

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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