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Stockholders' Equity (Details 2) - USD ($) shares in Thousands, $ in Millions	3 Months Ended						6 Months Ended		12 Months Ended	18 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Jun. 30, 2023
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during period (in shares)							2,300	6,600
Amount of stock repurchased during period							$ 155	$ 590
stock repurchase accrued but unpaid								$ 14
2022 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during period (in shares)	800	0	0	0	0	0	800		0	800
Amount of stock repurchased during period	$ 50	$ 0	$ 0	$ 0	$ 0	$ 0	$ 50		$ 0	$ 50
2021 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during period (in shares)	1,200	1,100	2,200	6,100	5,300	1,300	2,300		14,900	17,200
Amount of stock repurchased during period	$ 80	$ 75	$ 223	$ 532	$ 490	$ 100	$ 155		$ 1,345	$ 1,500

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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