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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Less than one year | $ 1,056 |
One year through five years | 7,123 |
After five years through ten years | 4,492 |
Greater than ten years | 4,190 |
Amortized Cost | 21,317 | $ 19,396
Fair Value |  |
Less than one year | 1,071 |
One year through five years | 7,390 |
After five years through ten years | 4,718 |
Greater than ten years | 4,855 |
Total | 22,574 | 21,188
Residential mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 849 |
Amortized Cost | 849 | 673
Fair Value |  |
Debt securities, maturity, without single maturity date | 863 |
Total | 863 | 705
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 1,160 |
Amortized Cost | 1,160 | 962
Fair Value |  |
Debt securities, maturity, without single maturity date | 1,209 |
Total | 1,209 | 1,046
Other asset-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 2,447 |
Amortized Cost | 2,447 | 2,369
Fair Value |  |
Debt securities, maturity, without single maturity date | 2,468 |
Total | $ 2,468 | $ 2,403

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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=123581744&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=123599081&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=123581744&loc=d3e27161-111563 + Details
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