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Investments (Concentrations of Credit Risk) (Details) - Investments in Japanese government and government agency securities: - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | $ 76,845 | $ 82,059
Concentrations of credit risk at fair value | 87,747 | 94,817
Assets supporting experience-rated contractholder liabilities |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 830 | 849
Concentrations of credit risk at fair value | 829 | 855
Available-for-sale | Fixed maturities |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 75,142 | 80,273
Concentrations of credit risk at fair value | 85,813 | 92,764
Held-to-maturity | Fixed maturities |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 850 | 912
Concentrations of credit risk at fair value | 1,082 | 1,173
Trading | Fixed maturities |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 23 | 25
Concentrations of credit risk at fair value | $ 23 | $ 25

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- Definition This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 + Details
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