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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
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Fixed Maturities Available-for-Sale [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | $ 1,124 | $ 633
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (11) | 0
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | (51) | (46)
Purchases | 72 | 112
Sales | 0 | 0
Settlements | (19) | (5)
Transfers into Level 3 | 19 | 0
Transfers out of Level 3 | (8) | (1)
Ending balance | 1,126 | 693
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | 0 | 0
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | (51) | (44)
Corporate Bonds and Other [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 770 | 468
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (13) |
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | (40) | (37)
Purchases | 42 | 67
Settlements | (2) | (2)
Transfers into Level 3 | 10 |
Ending balance | 767 | 496
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | (40) | (35)
States, Municipalities and Political Subdivisions [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 46 |
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | (2) |
Ending balance | 44 |
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 | 308 | 165
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 2 |
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | (9) | (9)
Purchases | 30 | 45
Settlements | (17) | (3)
Transfers into Level 3 | 9 |
Transfers out of Level 3 | (8) | (1)
Ending balance | 315 | 197
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | (9) | (9)
Fixed Maturities Trading [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 8 | 4
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (3) | (1)
Ending balance | 5 | 3
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | (3) | (1)
Total Fixed Maturities [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 1,132 | 637
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (14) | (1)
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | (51) | (46)
Purchases | 72 | 112
Sales | 0 | 0
Settlements | (19) | (5)
Transfers into Level 3 | 19 | 0
Transfers out of Level 3 | (8) | (1)
Ending balance | 1,131 | 696
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | (3) | (1)
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | (51) | (44)
Equity Securities [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 43 | 19
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 2 | (3)
Ending balance | 45 | 16
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | $ 2 | $ 3

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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=117815213&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=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from asset 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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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