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Accumulated Other Comprehensive Income
 12 Months Ended
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss) ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Activity in Accumulated other comprehensive income (loss) is shown below:
Foreign currency translation2018 2019 2020 
Beginning balance$(369)(600)(794)
Other comprehensive income (loss), net of taxes of $0, $(16) and $29, respectively
(214)(194)83 
Reclassified to gain/loss on sale of business(17)— — 
Ending balance(600)(794)(711)
Pension and postretirement
Beginning balance(662)(420)(928)
Actuarial gains (losses) deferred during the period, net of taxes of $(76), $165
   and $15, respectively
250 (560)(49)
Amortization of deferred actuarial losses into earnings, net of taxes of $(29), $(15)
   and $(34), respectively
94 52 113 
Adoption of accounting standard update(102)— — 
Ending balance(420)(928)(864)
Cash flow hedges
Beginning balance12 5 — 
Gains (Losses) deferred during the period, net of taxes of $0, $1 and $2,
   respectively
2 (3)(9)
Reclassifications of realized (gains) losses to sales and cost of sales, net of taxes
   of $4, $0 and $(2), respectively
(11)(2)7 
Adoption of accounting standard update2 — — 
Ending balance5 — (2)
Accumulated other comprehensive income (loss)$(1,015)(1,722)(1,577)