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Benefit Plans Estimated Future Benefit Payments (Details) $ in Millions	Sep. 30, 2023 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 809
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	814
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	812
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	812
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	809
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	3,918
Other Post-retirement Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	22
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	21
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	21
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	21
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	21
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 119

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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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-Name Accounting Standards Codification
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