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Benefit Plans Contributions (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions	$ 75		$ 13	$ 25
401(k) Contributions			22
Scenario, Forecast | Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions				225
Scenario, Forecast | Other Post-retirement Benefits
Retirement Plan Disclosure
Defined benefit plan contributions				$ 300
Minimum | Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions			$ 1
Minimum | Scenario, Forecast | Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions		$ 6

X

- Definition

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

+ References

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-Publisher FASB
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- Definition

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+ References

No definition available.

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- Definition

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+ References

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