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Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - Fair Value Inputs Level3 [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | $ 2,068 | $ 1,330
Total gains or (losses) (realized/unrealized) Included in earnings | (10) | (18)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | $ (36) | $ (2)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income Extensible List | Other comprehensive income (loss), net of tax | Other comprehensive income (loss), net of tax
Purchases, issuances and settlements | $ 481 | $ 758
Transfers in and/or (out) of Level 3 | (779) |
Balance, end of period | 1,725 | 2,068
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date | $ (15) | $ (24)
Fair Value Asset Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List | Unrealized Gain Loss On Investments | Unrealized Gain Loss On Investments
Domestic Corporate Debt Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | $ 801 | $ 701
Total gains or (losses) (realized/unrealized) Included in earnings | (10) | (12)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | 3 | 4
Purchases, issuances and settlements | (45) | 107
Transfers in and/or (out) of Level 3 | (35) |
Balance, end of period | 715 | 801
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date | (23) | (16)
Asset Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 1,251 | 623
Total gains or (losses) (realized/unrealized) Included in earnings |  | (6)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | (35) | (7)
Purchases, issuances and settlements | 513 | 641
Transfers in and/or (out) of Level 3 | (735) |
Balance, end of period | 994 | 1,251
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date | 8 | (8)
C M B S [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period |  |
Total gains or (losses) (realized/unrealized) Included in earnings |  |
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) |  |
Purchases, issuances and settlements | 6 |
Transfers in and/or (out) of Level 3 | (6) |
Balance, end of period |  |
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date |  |
Foreign Corporate Debt Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance, beginning of period | 16 | 6
Total gains or (losses) (realized/unrealized) Included in earnings |  |
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | (4) |
Purchases, issuances and settlements | 8 | 10
Transfers in and/or (out) of Level 3 | (4) |
Balance, end of period | 16 | 16
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date |  |

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- Definition Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from asset measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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