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Accumulated Other Comprehensive Income (Loss) by Component (Schedule of accumulated other comprehensive income (loss) by component) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | $ 12,809 |
Other comprehensive income (loss) before reclassifications | (1,630) | $ (594)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (7) | 22
Other comprehensive income (loss) after tax (expense) benefit | (1,623) | (616)
Total stockholder's equity at end of period | 10,817 | 12,089
Reclassification from AOCI, tax | 3 | (5)
Tax (expense) benefit on other comprehensive income (loss) | 423 | 160
Accumulated other comprehensive income (loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | 320 | 803
Total stockholder's equity at end of period | (1,303) | 187
Net unrealized gains (losses) on investments with an allowance for credit losses |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period |  | 0
Other comprehensive income (loss) before reclassifications |  | (3)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax |  | (3)
Other comprehensive income (loss) after tax (expense) benefit |  | 0
Total stockholder's equity at end of period |  | 0
Net unrealized gains (losses) on investments with an allowance for credit losses | Net unrealized gains (losses) on investments with an allowance for credit losses |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | (2) |
Other comprehensive income (loss) before reclassifications | (4) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 |
Other comprehensive income (loss) after tax (expense) benefit | (4) |
Total stockholder's equity at end of period | (6) |
Reclassification from AOCI, tax |  | 1
Tax (expense) benefit on other comprehensive income (loss) |  | 0
Net unrealized gains (losses) on investments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period |  | 1,745
Other comprehensive income (loss) before reclassifications |  | (593)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax |  | 34
Other comprehensive income (loss) after tax (expense) benefit |  | (627)
Total stockholder's equity at end of period |  | 1,118
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Reclassification from AOCI, tax | 0 |
Tax (expense) benefit on other comprehensive income (loss) | 1 |
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on other investments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | 1,039 |
Other comprehensive income (loss) before reclassifications | (1,612) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (1) |
Other comprehensive income (loss) after tax (expense) benefit | (1,611) |
Total stockholder's equity at end of period | (572) |
Reclassification from AOCI, tax | 1 | (8)
Tax (expense) benefit on other comprehensive income (loss) | 424 | 162
Pension and postretirement benefits |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | (604) | (848)
Other comprehensive income (loss) before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (6) | (9)
Other comprehensive income (loss) after tax (expense) benefit | 6 | 9
Total stockholder's equity at end of period | (598) | (839)
Reclassification from AOCI, tax | 2 | 2
Tax (expense) benefit on other comprehensive income (loss) | (2) | (2)
Cumulative foreign currency translation adjustment |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | (113) | (94)
Other comprehensive income (loss) before reclassifications | (14) | 2
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0
Other comprehensive income (loss) after tax (expense) benefit | (14) | 2
Total stockholder's equity at end of period | (127) | (92)
Reclassification from AOCI, tax | 0 | 0
Tax (expense) benefit on other comprehensive income (loss) | $ 0 | $ 0

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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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