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Background and Basis of Presentation (Share Repurchase Table) (Details) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) $ / shares shares
Equity, Class of Treasury Stock [Line Items] |
Aggregate cost of shares repurchased | $ 325
January 2021 Share Repurchase Program [Member] |
Equity, Class of Treasury Stock [Line Items] |
Total number of shares repurchased (shares) | shares | 6.9
Aggregate cost of shares repurchased | $ 325
Average price per share of shares repurchased (usd per share) | $ / shares | $ 47.02

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