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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
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 at amortized cost arising form the subject financial instrument (as defined), weather from an individual counterparties or groups of counterparties

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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

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