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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020
Retirement Benefits [Abstract]
Defined contribution plan, employer matching contribution, percent of match	7.00%
Reduction in accumulated postretirement benefit obligation related to plan amendment		$ 157
Adjustment in other comprehensive income related to plan amendment		118
Deferred income taxes related to plan amendment		$ 39
Amortization period for reduction of future net periodic cost		3 years 4 months 24 days
Actuarial loss related to plan amendment		$ 12

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Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment.

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Percentage employer matches of the employee's percentage contribution matched.

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Amount, after tax, of 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 tax expense (benefit) for increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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Defined Benefit Plan, Accumulated Benefit Obligation, Future Remaining Service Period of Eligible Active Employees

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