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Investments (Fair Value of Trading Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | $ 3,498 | $ 4,460
Corporate bonds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 2,248 | 2,734
U.S. government bonds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities |  | 32
Foreign government bonds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 49 | 73
RMBS |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 99 | 95
CMBS |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 137 | 137
ABS [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 919 | 1,338
State and municipal bonds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 21 | 27
Hybrid and redeemable preferred securities |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | $ 25 | $ 24

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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