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Stockholders' Equity (Summary Of Dividends Paid On Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022
Stockholders Equity [Line Items] |  |  |  |  |  |
Dividends amount | $ 0 | $ 462 | $ 596 | $ 1,007 | $ 830 | $ 667
Dividends rate per share | $ 0 | $ 0.72 | $ 0.89 | $ 1.55 | $ 1.27 | $ 1
Total year to date | $ 1,370 |  |  | $ 2,504 |  |
Fixed Dividend [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Dividends amount | 0 | $ 128 | $ 133 | 117 | $ 105 | $ 109
Dividends rate per share |  |  | $ 0.2 |  |  | $ 0.16
Total year to date | 388 |  |  | 331 |  |
Variable Dividend [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Dividends amount | 0 | $ 334 | $ 463 | 890 | $ 725 | $ 558
Total year to date | $ 982 |  |  | $ 2,173 |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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