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Investments - Debt Securities (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Total | $ 15,119
Gross Unrealized Gains | 172
Gross Unrealized Losses | (36)
Fair Value | 15,255
Supporting experience-rated products |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Gross Unrealized Gains | 12
Gross Unrealized Losses | (2)
Fair Value | 916
U.S. government securities |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Total | 1,662
Gross Unrealized Gains | 26
Gross Unrealized Losses | 0
Fair Value | 1,688
States, municipalities and political subdivisions |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Total | 2,370
Gross Unrealized Gains | 30
Gross Unrealized Losses | (1)
Fair Value | 2,399
U.S. corporate securities |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Total | 6,444
Gross Unrealized Gains | 61
Gross Unrealized Losses | (16)
Fair Value | 6,489
Foreign securities |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Total | 2,355
Gross Unrealized Gains | 31
Gross Unrealized Losses | (3)
Fair Value | 2,383
Residential mortgage-backed securities |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Total | 567
Gross Unrealized Gains | 10
Gross Unrealized Losses | 0
Fair Value | 577
Commercial mortgage-backed securities |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Total | 594
Gross Unrealized Gains | 11
Gross Unrealized Losses | 0
Fair Value | 605
Other asset-backed securities |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Total | 1,097
Gross Unrealized Gains | 3
Gross Unrealized Losses | (15)
Fair Value | 1,085
Redeemable preferred securities |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |
Total | 30
Gross Unrealized Gains | 0
Gross Unrealized Losses | (1)
Fair Value | $ 29

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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