Amount Recognized In Accumulated Other Comprehensive Income Consists Of [Abstract]

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Amount Recognized In The Consolidated Balance Sheets Consist Of [Abstract]

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Change In Benefit Obligation [Abstract]

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Funded Status At End Of Year [Abstract]

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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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 payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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Amount, before benefit payment, of receipt from prescription drug subsidy which increases benefit obligation of defined benefit postretirement plan.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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Employee Retirement Plans (Postretirement Benefits) (Details) - Postretirement Benefits [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Change in benefit obligation
Benefit obligation at beginning of year	$ 789	$ 776
Service cost	10	10	$ 9
Interest cost	24	26	26
Plan participants’ contributions	8	8
Plan amendments	(40)
Actuarial loss (gain)	(48)	17
Benefits paid	(46)	(50)
Medicare subsidy received	2	2
Benefit obligation at end of year	699	789	776
Funded status at end of year
Benefit obligations	$ (789)	$ (776)	$ (776)	$ (699)	$ (789)
Funded status of plans				(699)	(789)
Amounts recognized in the consolidated balance sheets consist of:
Current liability				(37)	(40)
Noncurrent liability				(662)	(749)
Recognized liability				(699)	(789)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss				21	68
Prior service credit				(44)	(12)
Amount recognized at end of year				$ (23)	$ 56