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STATEMENT OF CONSOLIDATED EQUITY (unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Statement Of Stockholders Equity [Abstract]      
Dividend per common share   $ 0.775  
Accumulated other comprehensive loss $ (367) $ (367) $ (291)
Unrecognized prior service costs (credits) 3 3 (3)
Net unrealized translation loss (365) (365) (328)
Investment securities unrealized gain $ 0 $ 0 $ 34
Common shares issued (in shares)   281,077  
Common shares repurchased (in shares) 2,236,546 2,236,546