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Changes in and Reclassifications From Accumulated Other Comprehensive Income (Loss) - AOCI Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | $ 18,556 | $ 16,270 |
OCI, net of tax | (998) | 1,118 | $ 1,631
Ending balance | 17,843 | 18,556 | 16,270
Net Unrealized Gain on Fixed Maturities |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 2,834 | 1,684 | 24
OCI, before Reclassifications, before Tax, Attributable to Parent | (1,307) | 1,627 | 2,275
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 234 | 171 | 174
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (1,541) | 1,456 | 2,101
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 323 | (306) | (441)
OCI, net of tax | (1,218) | 1,150 | 1,660
Ending balance | 1,616 | 2,834 | 1,684
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (2) | (3) | (4)
OCI, before Reclassifications, before Tax, Attributable to Parent | 0 | 1 | 1
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 0 | 0 | 0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | 0 | 1 | 1
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 0 | 0 | 0
OCI, net of tax | 0 | 1 | 1
Ending balance | (2) | (2) | (3)
Net Gain (Loss) on Cash Flow Hedging Instruments |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 12 | 9 | (5)
OCI, before Reclassifications, before Tax, Attributable to Parent | 28 | 30 | 28
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 36 | 26 | 10
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (8) | 4 | 18
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 2 | (1) | (4)
OCI, net of tax | (6) | 3 | 14
Ending balance | 6 | 12 | 9
Foreign Currency Translation Adjustments |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 43 | 34 | 30
OCI, before Reclassifications, before Tax, Attributable to Parent | (3) | 11 | 5
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 0 | 0 | 0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (3) | 11 | 5
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 1 | (2) | (1)
OCI, net of tax | (2) | 9 | 4
Ending balance | 41 | 43 | 34
Pension and Other Postretirement Plan Adjustments |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (1,717) | (1,672) | (1,624)
OCI, before Reclassifications, before Tax, Attributable to Parent | 219 | (117) | (104)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (70) | (60) | (43)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | 289 | (57) | (61)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (61) | 12 | 13
OCI, net of tax | 228 | (45) | (48)
Ending balance | (1,489) | (1,717) | (1,672)
AOCI, net of tax |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 1,170 | 52 | (1,579)
OCI, before Reclassifications, before Tax, Attributable to Parent | (1,063) | 1,552 | 2,205
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 200 | 137 | 141
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent | (1,263) | 1,415 | 2,064
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 265 | (297) | (433)
OCI, net of tax | (998) | 1,118 | 1,631
Ending balance | $ 172 | $ 1,170 | $ 52

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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