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Stockholders' Equity (Summary of Purchases of Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2020
1.0 Billion Dollar Share Repurchase Program Closed [Member]
Stockholders Equity [Line Items]
Total Number of Shares Purchased			2,243		2,243
Dollar Value of Shares Purchased			$ 38		$ 38
Average Price Paid per Share			$ 16.85		$ 16.85
2.0 Billion Dollar Share Repurchase Program Open [Member]
Stockholders Equity [Line Items]
Total Number of Shares Purchased	11,708	13,983
Dollar Value of Shares Purchased	$ 718	$ 589
Average Price Paid per Share	$ 61.36	$ 42.15
5.0 Billion Dollar Share Repurchase Program Closed [Member]
Stockholders Equity [Line Items]
Total Number of Shares Purchased				25,691
Dollar Value of Shares Purchased				$ 1,307
Average Price Paid per Share				$ 50.90

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