Investments - Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
One year or less, Amortized cost	$ 607
One year or less, Fair value	615
After one year through five years, Amortized Cost	3,564
After one year through five years, Fair Value	3,728
After five years through ten years, Amortized Cost	5,672
After five years through ten years, Fair Value	6,108
After ten years, Amortized Cost	7,955
After ten years, Fair Value	9,225
Amortized Cost	25,336	$ 24,898
Fixed maturities including securities pledged, Fair Value	27,460	25,034
Mortgage-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	6,066
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	6,310
Other asset-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	1,472
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	1,474
Amortized Cost	1,472	1,230
Fixed maturities including securities pledged, Fair Value	$ 1,474	$ 1,208

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

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-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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