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Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Balance, end of period $ 3,381 $ 3,114 $ 3,381 $ 3,114
Cash dividends declared per common share $ 0.300 $ 0.275 $ 0.600 $ 0.550
Common Stock and Paid in Capital [Member]        
Balance, beginning of period $ 328 $ 771 $ 328 $ 770
Compensation expense and common shares issued [1] 4 2 4 3
Common shares purchased under repurchase program [2] (155) 0 (155) 0
Balance, end of period 177 773 177 773
Retained earnings [Member]        
Balance, beginning of period 2,827 2,686 2,796 2,649
Adoption of new accounting pronouncements 0 0 0 (2)
Net income 786 41 834 97
Regular dividends (17) (17) (34) (34)
Balance, end of period 3,596 2,710 3,596 2,710
Accumulated other comprehensive income (loss) [Member]        
Balance, beginning of period (392) (335) (372) (383)
Unrealized translation gain (loss) (5) (34) (21) 14
Unrealized gain on commodity hedges 5 0 1 0
Balance, end of period $ (392) $ (369) $ (392) $ (369)
[1] Common shares issued were 13,935 shares and 41,512 shares for the three months ended March 31, 2022 and 2021, respectively, and 108,650 shares and 140,706 shares for the six months ended March 31, 2022 and 2021, respectively.
[2] Common shares repurchased were 2,403,380 shares for the three and six months ended March 31, 2022.