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Accumulated Other Comprehensive Income (Loss) by Component Schedule of Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | $ 11,969 | $ 11,756
Other comprehensive income (loss) before reclassifications | 262 | 163
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 57 | 21
Total stockholder's equity at end of period | 12,244 | 11,969
Other comprehensive income (loss) after tax (expense) benefit | 205 | 142
Reclassification from AOCI, tax | (24) | (7)
Tax (expense) benefit on other comprehensive income (loss) | (75) | (121)
Net unrealized gains (losses) on investments with OTTI losses |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | 30 | 27
Other comprehensive income (loss) before reclassifications | (3) | 9
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 2 | 6
Total stockholder's equity at end of period | 25 | 30
Other comprehensive income (loss) after tax (expense) benefit | (5) | 3
Reclassification from AOCI, tax | (1) | (3)
Tax (expense) benefit on other comprehensive income (loss) | 2 | (1)
Net unrealized gains (losses) on other investments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | 642 | 390
Other comprehensive income (loss) before reclassifications | 190 | 290
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 82 | 38
Total stockholder's equity at end of period | 750 | 642
Other comprehensive income (loss) after tax (expense) benefit | 108 | 252
Reclassification from AOCI, tax | (38) | (16)
Tax (expense) benefit on other comprehensive income (loss) | (68) | (117)
Pension and postretirement benefits |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | (647) | (648)
Other comprehensive income (loss) before reclassifications | (25) | (22)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (27) | (23)
Total stockholder's equity at end of period | (645) | (647)
Other comprehensive income (loss) after tax (expense) benefit | 2 | 1
Reclassification from AOCI, tax | 15 | 12
Tax (expense) benefit on other comprehensive income (loss) | (9) | (3)
Cumulative foreign currency translation adjustment |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | (198) | (84)
Other comprehensive income (loss) before reclassifications | 100 | (114)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0
Total stockholder's equity at end of period | (98) | (198)
Other comprehensive income (loss) after tax (expense) benefit | 100 | (114)
Reclassification from AOCI, tax | 0 | 0
Tax (expense) benefit on other comprehensive income (loss) | 0 | 0
Accumulated other comprehensive income (loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | (173) | (315)
Total stockholder's equity at end of period | $ 32 | $ (173)

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + 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/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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