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Retirement Plans Projected Benefit Payments from Plans (Details) $ in Millions	Sep. 30, 2019 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated future employer contributions to defined benefit plans in next fiscal year	$ 50
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2020	311
2021	289
2022	294
2023	297
2024	303
2025-2029	1,487
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated future employer contributions to defined benefit plans in next fiscal year	4
2020	17
2021	16
2022	16
2023	16
2024	15
2025-2029	$ 58

X

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

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