Fair Value - Summary of Unobservable Inputs (Details) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Unobservable Inputs
Available-for-sale securities	$ 112,225	$ 110,561
Mortgage loans		24,148
Investment funds	14,128	9,866
Level 3
Fair Value Unobservable Inputs
Available-for-sale securities	10,671	7,512
Mortgage loans	30,811
Level 3 \| Valuation Technique, Discounted Cash Flow
Fair Value Unobservable Inputs
Investment funds	506
Level 3 \| Reported net asset value
Fair Value Unobservable Inputs
Investment funds	563
Level 3 \| Net tangible asset values
Fair Value Unobservable Inputs
Investment funds	529
Level 3 \| Discounted cash flow/guideline public equity
Fair Value Unobservable Inputs
Investment funds	873
Interest sensitive contract liabilities \| Embedded derivatives \| Level 3
Fair Value Unobservable Inputs
Total liabilities measured at fair value	$ 5,841	$ 14,907
Measurement Input, Entity Credit Risk [Member] \| Minimum
Fair Value Unobservable Inputs
Embedded Derivative Liability, Measurement Input	0.001	0.001
Measurement Input, Entity Credit Risk [Member] \| Maximum
Fair Value Unobservable Inputs
Embedded Derivative Liability, Measurement Input	0.017	0.010
Measurement Input, Entity Credit Risk [Member] \| Weighted Average
Fair Value Unobservable Inputs
Embedded Derivative Liability, Measurement Input	0.010	0.006
Measurement Input, Option Volatility [Member] \| Minimum
Fair Value Unobservable Inputs
Embedded Derivative Liability, Measurement Input	0.005	0.004
Measurement Input, Option Volatility [Member] \| Maximum
Fair Value Unobservable Inputs
Embedded Derivative Liability, Measurement Input	0.053	0.034
Measurement Input, Option Volatility [Member] \| Weighted Average
Fair Value Unobservable Inputs
Embedded Derivative Liability, Measurement Input	0.019	0.019
Measurement Input, Withdrawal Rate [Member] \| Minimum
Fair Value Unobservable Inputs
Embedded Derivative Liability, Measurement Input	0.051	0.059
Measurement Input, Withdrawal Rate [Member] \| Maximum
Fair Value Unobservable Inputs
Embedded Derivative Liability, Measurement Input	0.115	0.107
Measurement Input, Withdrawal Rate [Member] \| Weighted Average
Fair Value Unobservable Inputs
Embedded Derivative Liability, Measurement Input	0.081	0.080
Discount rate \| Minimum
Fair Value Unobservable Inputs
Debt Securities, Available-for-sale, Measurement Input	0.022	0.014
Mortgage loans, Measurement Input	0.015
Investment funds, measurement input	0.064
Discount rate \| Minimum \| Measurement Input, Implied Multiple
Fair Value Unobservable Inputs
Investment funds, measurement input	1.26
Discount rate \| Minimum \| Discounted cash flow/guideline public equity
Fair Value Unobservable Inputs
Investment funds, measurement input	0.165
Discount rate \| Maximum
Fair Value Unobservable Inputs
Debt Securities, Available-for-sale, Measurement Input	0.188	0.194
Mortgage loans, Measurement Input	0.221
Investment funds, measurement input	0.064
Discount rate \| Maximum \| Measurement Input, Implied Multiple
Fair Value Unobservable Inputs
Investment funds, measurement input	1.26
Discount rate \| Maximum \| Discounted cash flow/guideline public equity
Fair Value Unobservable Inputs
Investment funds, measurement input	0.165
Discount rate \| Weighted Average
Fair Value Unobservable Inputs
Debt Securities, Available-for-sale, Measurement Input	0.068	0.054
Mortgage loans, Measurement Input	0.063
Investment funds, measurement input	0.064
Discount rate \| Weighted Average \| Measurement Input, Implied Multiple
Fair Value Unobservable Inputs
Investment funds, measurement input	1.26
Discount rate \| Weighted Average \| Discounted cash flow/guideline public equity
Fair Value Unobservable Inputs
Investment funds, measurement input	0.165
Measurement Input, P/E Ratio \| Minimum \| Discounted cash flow/guideline public equity
Fair Value Unobservable Inputs
Investment funds, measurement input	9
Measurement Input, P/E Ratio \| Maximum \| Discounted cash flow/guideline public equity
Fair Value Unobservable Inputs
Investment funds, measurement input	9
Measurement Input, P/E Ratio \| Weighted Average \| Discounted cash flow/guideline public equity
Fair Value Unobservable Inputs
Investment funds, measurement input	9

Other investments including, but not limited to: partnership interests, credit funds, hedge funds, and private equity.

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- Definition

Investment funds, measurement input

+ References

No definition available.

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- Definition

Mortgage loans, Measurement Input

+ References

No definition available.

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- Definition

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 942
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Value of input used to measure 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
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-Section 50
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- Definition

Value of input used to measure embedded derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value of financial and nonfinancial obligations.

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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