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RETIREMENT PENSION PLANS - Schedule of Projected Benefit Obligation Accumulated Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Retirement Benefits [Abstract]    
ABO Exceeds Assets, PBO $ 1,012 $ 926
ABO Exceeds Assets, ABO 1,012 926
ABO Exceeds Assets, Plan Assets 741 744
Assets Exceed ABO, PBO 615 550
Assets Exceed ABO, ABO 615 550
Assets Exceed ABO, Plan Assets 764 702
PBO 1,627 1,476
ABO 1,627 1,476
Total assets at fair value $ 1,505 $ 1,446