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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, 2020 | Mar. 31, 2019
Fixed Maturities Available-for-Sale [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | $ 633 | $ 419
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | 0 | 0
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | (46) | 11
Purchases | 112 | 76
Sales | 0 | 0
Settlements | (5) | (6)
Transfers into Level 3 | 0 | 5
Transfers out of Level 3 | (1) | (68)
Ending balance | 693 | 437
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 | (44) | 10
Corporate Bonds and Other [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 468 | 222
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | (37) | 8
Purchases | 67 | 56
Settlements | (2) | (2)
Transfers out of Level 3 |  | (31)
Ending balance | 496 | 253
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | (35) | 7
Asset-Backed [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 165 | 197
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | (9) | 3
Purchases | 45 | 20
Settlements | (3) | (4)
Transfers into Level 3 |  | 5
Transfers out of Level 3 | (1) | (37)
Ending balance | 197 | 184
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | (9) | 3
Fixed Maturities Trading [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 4 | 6
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (1) | (1)
Ending balance | 3 | 5
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | (1) | (1)
Total Fixed Maturities [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 637 | 425
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (1) | (1)
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI | (46) | 11
Purchases | 112 | 76
Sales | 0 | 0
Settlements | (5) | (6)
Transfers into Level 3 | 0 | 5
Transfers out of Level 3 | (1) | (68)
Ending balance | 696 | 442
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | (1) | (1)
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities | (44) | 10
Equity Securities [Member] |  |
Reconciliations for All Assets and Liabilities [Roll Forward] |  |
Beginning balance | 19 | 19
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income | (3) | 2
Ending balance | 16 | 21
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities | $ (3) | $ 2

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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 No definition available. + 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 transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + 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)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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