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Investments Investments (Allowance for Credit Loss Roll Forward) (Details) - Available-for-sale Securities [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance | $ 31 | $ 20
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 11 | 6
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | (2) | (3)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 2 | 1
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance | 42 | 22
Corporate Debt Securities [Member] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance | 26 | 17
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 6 | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | (1) | (1)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 2 | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance | 33 | 16
Asset-backed Securities [Member] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance | 0 | 0
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 5 | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | 0 | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 0 | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance | 5 | 0
Commercial Mortgage Backed Securities [Member] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance | 1 | 3
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 1
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | 0 | (2)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 0 | 1
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance | 1 | 1
Debt Security, Government, Non-US [Member] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance | 4 | 0
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 5
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold | (1) | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 0 | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance | $ 3 | $ 5

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- Definition This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL6284393-111563 + Details
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- Definition This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL6284393-111563 + Details
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- Definition The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL6284393-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL6284393-111563 + Details
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- Definition This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL6284393-111563 + Details
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