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Benefit Plans - Postemployment Benefit Costs (Details) - Postemployment Benefit Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 4	$ 4
Interest cost	1	2	3	4
Amortization of net gains	(1)	(1)	(2)	(2)
Net periodic benefit costs	$ 1	$ 2	$ 5	$ 6

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

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

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

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