Background and Basis of Presentation (Share Repurchase Table) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	18 Months Ended
Mar. 31, 2019	Jun. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Aggregate cost of shares repurchased	$ 151
January 2018 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total number of shares repurchased (shares)	2.7	34.0
Aggregate cost of shares repurchased	$ 151
Average price per share of shares repurchased (usd per share)	$ 56.34	$ 58.86

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

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Number of shares that have been repurchased during the period and are being held in treasury.

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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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