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Investments - Unrealized Loss Position Maturities (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | $ 2,409
Unrealized losses, total | 36
Supporting experience-rated products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 157
Unrealized losses, total | 2
Supporting remaining products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 2,252
Unrealized losses, total | 34
Residential mortgage-backed securities |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 1
Unrealized losses, total | 0
Residential mortgage-backed securities | Supporting experience-rated products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 0
Unrealized losses, total | 0
Residential mortgage-backed securities | Supporting remaining products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 1
Unrealized losses, total | 0
Other asset-backed securities |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 528
Unrealized losses, total | 15
Other asset-backed securities | Supporting experience-rated products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 4
Unrealized losses, total | 0
Other asset-backed securities | Supporting remaining products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 524
Unrealized losses, total | 15
Less than one year |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 329
Unrealized losses, total | 0
Less than one year | Supporting experience-rated products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 21
Unrealized losses, total | 0
Less than one year | Supporting remaining products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 308
Unrealized losses, total | 0
One year through five years |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 593
Unrealized losses, total | 7
One year through five years | Supporting experience-rated products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 36
Unrealized losses, total | 2
One year through five years | Supporting remaining products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 557
Unrealized losses, total | 5
After five years through ten years |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 539
Unrealized losses, total | 9
After five years through ten years | Supporting experience-rated products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 47
Unrealized losses, total | 0
After five years through ten years | Supporting remaining products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 492
Unrealized losses, total | 9
Greater than ten years |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 419
Unrealized losses, total | 5
Greater than ten years | Supporting experience-rated products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 49
Unrealized losses, total | 0
Greater than ten years | Supporting remaining products |
Schedule of Available-for-sale Securities [Line Items] |
Fair value, total | 370
Unrealized losses, total | $ 5

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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