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Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - Market Value [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities | $ 2,164 | $ 1,526 | $ 2,068 | $ 1,330
Total gains or (losses) (realized/unrealized) Included in earnings | (2) |  | 9 | (19)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | 59 | (2) | (28) | 10
Purchases, issuances and settlements | 186 | 279 | 358 | 482
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories | (779) |  | (779) |
Ending balance | 1,628 | 1,803 | 1,628 | 1,803
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 assets still held at the reporting date | (3) | (2) |  | (24)
Corporate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities | 863 | 706 | 801 | 701
Total gains or (losses) (realized/unrealized) Included in earnings | (2) | 3 | 9 | (12)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | (6) | (1) | (13) | 6
Purchases, issuances and settlements | 27 | 87 | (43) | 99
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories | (163) |  | (35) |
Ending balance | 719 | 794 | 719 | 794
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 assets still held at the reporting date | (3) | 1 | (8) | (16)
Asset Backed Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities | 1,255 | 815 | 1,251 | 623
Total gains or (losses) (realized/unrealized) Included in earnings |  | (3) |  | (7)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | 65 |  | (11) | 4
Purchases, issuances and settlements | 159 | 192 | 387 | 384
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories | (587) |  | (735) |
Ending balance | 893 | 1,004 | 893 | 1,004
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 assets still held at the reporting date |  | (3) | 8 | (8)
CMBS [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities | 6 |  |  |
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 |
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories | (6) |  | (6) |
Ending balance |  |  |  |
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 assets still held at the reporting date |  |  |  |
Foreign Corporate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities | 40 | 5 | 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 | (1)
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories | (24) |  | (4) |
Ending balance | 16 | 5 | 16 | 5
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 assets still held at the reporting date |  |  |  |

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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 purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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