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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019
5.0 Billion Dollar Share Repurchase Program [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
1.0 Billion Dollar Share Repurchase Program [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 |

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- Definition Number of shares that have been repurchased and retired during the period. + 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 http://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 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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