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New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Retained earnings | $ 6,707 | $ 6,762 | $ 9,445 | $ 9,346 | $ 9,578 | $ 9,360 | $ 9,242 | $ 8,769 |
Total stockholders equity | 4,569 | 2,668 | 9,654 | 15,184 | 20,754 | 21,165 | 21,742 | 19,587 | $ 22,699
Accumulated other comprehensive income (loss) | $ (7,668) | $ (8,628) | $ (4,337) | $ 1,252 | $ 6,441 | $ 6,849 | $ 7,479 | $ 5,761 |
Accounting Standards Update 2018-12 [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  | 6,000
Total stockholders equity |  |  |  |  |  |  |  |  | 1,400
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  | 4,400
Accounting Standards Update 2018-12 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  | 6,500
Total stockholders equity |  |  |  |  |  |  |  |  | 1,900
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 4,900

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