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Stockholders' Equity (Summary of Purchases of Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended						9 Months Ended	12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
5.0 Billion Dollar Share Repurchase Program Closed [Member]
Stockholders Equity [Line Items]
Total Number of Shares Purchased	6,675	5,188	4,428	5,465	3,795	10,090	16,291	19,350	11,708	13,983
Dollar Value of Shares Purchased	$ 295	$ 256	$ 193	$ 247	$ 200	$ 545	$ 744	$ 992	$ 718	$ 589
Average Price Paid per Share	$ 44.23	$ 49.4	$ 43.47	$ 45.17	$ 52.7	$ 53.96	$ 45.67	$ 51.23	$ 61.36	$ 42.15
Share Repurchase Program Open [Member]
Stockholders Equity [Line Items]
Total Number of Shares Purchased							61,332
Dollar Value of Shares Purchased							$ 3,043
Average Price Paid per Share							$ 49.62

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Total cost of shares repurchased divided by the total number of shares repurchased.

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