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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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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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