Pension and Other Benefit Programs - One Percentage Point (ppt) Change on Projected Benefit Obligations (Detail) $ in Millions	Sep. 30, 2023 USD ($)
Retirement Benefits [Abstract]
Impact of 1 ppt Discount Rate decrease on Benefit Expense	$ 201
Impact of 1 ppt Discount Rate increase on Benefit Expense	(45)
Impact of 1 ppt Discount Rate decrease on Projected Benefit Obligations	2,038
Impact of 1 ppt Discount Rate increase on Projected Benefit Obligations	(1,798)
Impact of 1 ppt Expected Long-Term Rate of Return on Assets Decrease on Benefit Expense	170
Impact of 1 ppt Expected Long-Term Rate of Return on Assets Increase on Benefit Expense	$ (170)

- Definition

Sensitivity Analysis Of Net Periodic Pension And Postretirement Cost, Impact Of 1 Percentage Point Decrease In Expected Long Term Rate Of Return On Assets

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- Definition

Sensitivity Analysis Of Net Periodic Pension And Postretirement Cost, Impact Of 1 Percentage Point Increase In Expected Long Term Rate Of Return On Assets

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- Definition

Sensitivity Analysis Of Net Periodic Pension And Postretirement Medical Cost, Impact Of 1 Percentage Point Decrease In Discount Rate

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- Definition

Sensitivity Analysis Of Net Periodic Pension And Postretirement Medical Cost, Impact Of 1 Percentage Point Increase In Discount Rate

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- Definition

Sensitivity Analysis Of Projected Benefit Obligations, Impact Of 1 Percentage Point Decrease In Discount Rate

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- Definition

Sensitivity Analysis Of Projected Benefit Obligations, Impact Of 1 Percentage Point Increase In Discount Rate

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