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Fair Value, Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fixed Maturities Available-for-Sale [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | $ 1,350 | $ 777 | $ 1,124 | $ 633
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 2 | 0 | (5) | 0
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | 2 | 14 | (27) | 45
Purchases | 138 | 194 | 428 | 345
Sales | (9) | 0 | (12) | (9)
Settlements | (22) | (17) | (74) | (31)
Transfers into Level 3 | 41 | 8 | 81 | 8
Transfers out of Level 3 | (90) | (2) | (103) | (17)
Ending balance | 1,412 | 974 | 1,412 | 974
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | 0 | 0 | 0 | 0
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | 2 | 13 | (27) | 48
Corporate Bonds and Other [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 883 | 555 | 770 | 468
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 1 |  | (9) |
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | 1 | 5 | (23) | 27
Purchases | 55 | 129 | 219 | 200
Sales |  |  | (3) |
Settlements | (11) | (3) | (35) | (9)
Transfers into Level 3 |  | 8 | 10 | 8
Transfers out of Level 3 | (52) |  | (52) |
Ending balance | 877 | 694 | 877 | 694
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | 2 | 5 | (22) | 29
States, Municipalities and Political Subdivisions [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 57 | 0 | 46 | 0
Purchases |  | 45 | 12 | 45
Settlements |  |  | (1) |
Ending balance | 57 | 45 | 57 | 45
Asset-Backed [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 410 | 222 | 308 | 165
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 1 |  | 4 |
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | 1 | 9 | (4) | 18
Purchases | 83 | 20 | 197 | 100
Sales | (9) |  | (9) | (9)
Settlements | (11) | (14) | (38) | (22)
Transfers into Level 3 | 41 |  | 71 |
Transfers out of Level 3 | (38) | (2) | (51) | (17)
Ending balance | 478 | 235 | 478 | 235
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities |  | 8 | (5) | 19
Fixed Maturities Trading [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 0 | 4 | 8 | 4
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income |  | 4 | (6) | 4
Settlements |  |  | (2) |
Ending balance | 0 | 8 | 0 | 8
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities |  | 4 |  | 4
Total Fixed Maturities [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 1,350 | 781 | 1,132 | 637
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 2 | 4 | (11) | 4
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | 2 | 14 | (27) | 45
Purchases | 138 | 194 | 428 | 345
Sales | (9) | 0 | (12) | (9)
Settlements | (22) | (17) | (76) | (31)
Transfers into Level 3 | 41 | 8 | 81 | 8
Transfers out of Level 3 | (90) | (2) | (103) | (17)
Ending balance | 1,412 | 982 | 1,412 | 982
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | 0 | 4 | 0 | 4
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | 2 | 13 | (27) | 48
Equity Securities [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 36 | 27 | 43 | 19
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (2) |  | (15) | (7)
Purchases | 1 | 12 | 11 | 12
Sales | (11) |  | (15) |
Transfers into Level 3 | 11 |  | 11 | 15
Transfers out of Level 3 | (10) |  | (10) |
Ending balance | 25 | $ 39 | 25 | 39
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | $ (3) |  | $ (1) | $ (7)

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) 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 http://asc.fasb.org/extlink&oid=123874694&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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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