Anticipated Medicare subsidy receipts.

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- Definition

Defined Benefit Plan Corridor Approach Percentage

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- Definition

Defined Benefit Plan, Period of Amortization

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Defined Benefit Plan, Plan Assets, Amount Pending Settlement

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- Definition

Defined benefit Obligation, Weighted-Average Discount Rate For Determining The Interest Cost

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- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cost for defined contribution plan.

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Pension and Other Benefit Programs - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions	$ 0	$ 0	$ 136,000,000
Amount pending settlement	$ 52,000,000	25,000,000
Period of amortization	4 years
Corridor approach percentage	10.00%
Cash surrender value of life insurance	$ 58,000,000	57,000,000
Net periodic post-retirement benefit costs	$ 0	$ 1,000,000	(15,000,000)
Discount rate	3.00%	4.00%
Weighted-average discount rate for determining interest costs (pension/SERP plans)	3.70%	3.00%
Health care cost trend rate assumed	6.70%
Ultimate health care cost trend rate	4.50%
Contribution plan cost	$ 42,000,000	$ 39,000,000	38,000,000
Supplemental Employee Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic post-retirement benefit costs	1,000,000	1,000,000	1,000,000
Post-retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic post-retirement benefit costs	2,000,000	$ 5,000,000	$ 5,000,000
Anticipated medicare subsidy receipts	$ 11,000,000
Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation, percentage			5.00%	65.00%
Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation, percentage			95.00%	35.00%