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Earnings Per Share and Common Stock - Accelerated Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023
Earnings Per Share [Abstract]
Number of shares	506,800	2,246,294	576,629	2,764,846	1,770,271	5,147,307	3,329,723	9,682,424	5,000,000
Average price per share (in usd per share)	$ 49.32	$ 44.52	$ 43.36	$ 36.17	$ 33.89	$ 34.00	$ 45.05	$ 34.60
Total	$ 25	$ 100	$ 25	$ 100	$ 60	$ 175	$ 150	$ 335

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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