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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Less than one year | $ 1,276 |
One year through five years | 6,346 |
After five years through ten years | 3,748 |
Greater than ten years | 4,022 |
Gross Amortized Cost | 19,396 | $ 15,898
Fair Value |  |
Less than one year | 1,291 |
One year through five years | 6,698 |
After five years through ten years | 4,121 |
Greater than ten years | 4,924 |
Total | 21,188 | 16,922
Residential mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 673 |
Gross Amortized Cost | 673 | 508
Fair Value |  |
Debt securities, maturity, without single maturity date | 705 |
Total | 705 | 533
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 962 |
Gross Amortized Cost | 962 | 654
Fair Value |  |
Debt securities, maturity, without single maturity date | 1,046 |
Total | 1,046 | 700
Other asset-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 2,369 |
Gross Amortized Cost | 2,369 | 1,397
Fair Value |  |
Debt securities, maturity, without single maturity date | 2,403 |
Total | $ 2,403 | $ 1,405

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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