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Background and Basis of Presentation (Share Repurchase Table) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Equity, Class of Treasury Stock [Line Items]
Aggregate cost of shares repurchased	$ 322	$ 972
January 2021 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total number of shares repurchased (shares)	6.7	20.2
Aggregate cost of shares repurchased	$ 322	$ 972
Average price per share of shares repurchased (usd per share)	$ 48.35	$ 48.17

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

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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