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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, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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
5.0 Billion Dollar Share Repurchase Program Closed [Member]
Stockholders Equity [Line Items]
Total Number of Shares Purchased			68,625	78,149			146,774
Dollar Value of Shares Purchased			$ 1,827	$ 2,978			$ 4,805
Average Price Paid per Share			$ 26.62	$ 38.11			$ 32.74
1.6 Billion Dollar Share Repurchase Program Open [Member]
Stockholders Equity [Line Items]
Total Number of Shares Purchased	13,983				13,983
Dollar Value of Shares Purchased	$ 589				$ 589
Average Price Paid per Share	$ 42.15				$ 42.15

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