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Postretirement Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Postretirement Benefit Plans [Line Items] |  |  |
Deferred actuarial gains in accumulated other comprehensive income | $ (1,347) |  |
Gains (Losses) that will be amortized into earnings in 2020 | (162) |  |
Postretirement Plans [Member] |  |  |
Postretirement Benefit Plans [Line Items] |  |  |
Deferred actuarial gains in accumulated other comprehensive income | 118 |  |
Gains (Losses) that will be amortized into earnings in 2020 | $ 13 |  |
Discount rates used in measuring benefit obligations | 2.99% | 4.08% | 3.45%
Health care cost trend rate assumed for next year | 7.00% |  |
Health care cost trend rate for current year | 7.20% |  |
Ultimate health care cost trend rate over subsequent 9 years | 5.00% |  |
Future health care benefit payments, 2020 | $ 12 |  |
Future health care benefit payments, 2021 | 12 |  |
Future health care benefit payments, 2022 | 12 |  |
Future health care benefit payments, 2023 | 12 |  |
Future health care beneift payments, 2024 | 12 |  |
Total future health care benefit payments, 2025 - 2029 | $ 49 |  |
Health care cost trend rate year | 9 years |  |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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