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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fixed Maturities Available-for-Sale [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | $ 1,126 | $ 693 | $ 1,124 | $ 633
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 4 | 0 | (7) | 0
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | 22 | 77 | (29) | 32
Purchases | 218 | 39 | 290 | 151
Sales | (3) | (9) | (3) | (9)
Settlements | (33) | (9) | (52) | (15)
Transfers into Level 3 | 21 | 0 | 40 | 0
Transfers out of Level 3 | (5) | (14) | (13) | (15)
Ending balance | 1,350 | 777 | 1,350 | 777
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 | 22 | 76 | (29) | 34
Corporate Bonds and Other [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 767 | 496 | 770 | 468
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 3 |  | (10) |
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | 16 | 59 | (24) | 22
Purchases | 122 | 4 | 164 | 71
Sales | (3) |  | (3) |
Settlements | (22) | (4) | (24) | (6)
Transfers into Level 3 |  |  | 10 |
Ending balance | 883 | 555 | 883 | 555
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | 16 | 58 | (24) | 24
States, Municipalities and Political Subdivisions [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 44 |  | 46 |
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | 2 |  |  |
Purchases | 12 |  | 12 |
Settlements | (1) |  | (1) |
Ending balance | 57 |  | 57 |
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | 2 |  |  |
Asset-Backed [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 315 | 197 | 308 | 165
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 1 |  | 3 |
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | 4 | 18 | (5) | 10
Purchases | 84 | 35 | 114 | 80
Sales |  | (9) |  | (9)
Settlements | (10) | (5) | (27) | (9)
Transfers into Level 3 | 21 |  | 30 |
Transfers out of Level 3 | (5) | (14) | (13) | (15)
Ending balance | 410 | 222 | 410 | 222
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | 4 | 18 | (5) | 10
Fixed Maturities Trading [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 5 | 3 | 8 | 4
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (3) | 1 | (6) |
Settlements | (2) |  | (2) |
Ending balance |  | 4 |  | 4
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities |  | 1 |  |
Total Fixed Maturities [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 1,131 | 696 | 1,132 | 637
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 1 | 1 | (13) | 0
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | 22 | 77 | (29) | 32
Purchases | 218 | 39 | 290 | 151
Sales | (3) | (9) | (3) | (9)
Settlements | (35) | (9) | (54) | (15)
Transfers into Level 3 | 21 | 0 | 40 | 0
Transfers out of Level 3 | (5) | (14) | (13) | (15)
Ending balance | 1,350 | 781 | 1,350 | 781
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | 0 | 1 | 0 | 0
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | 22 | 76 | (29) | 34
Equity Securities [Member] |  |  |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |  |  |
Beginning balance | 45 | 16 | 43 | 19
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (15) | (4) | (13) | (7)
Purchases | 10 |  | 10 |
Sales | (4) |  | (4) |
Transfers into Level 3 |  | 15 |  | 15
Ending balance | $ 36 | 27 | 36 | 27
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities |  | $ (4) | $ 2 | $ (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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