Investments (Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) loan item security	Dec. 31, 2020 USD ($) loan security item	Dec. 31, 2019 USD ($)
Investments [Line Items]
Increase (decrease) in gross AFS securities unrealized losses	$ (253)
Unrealized gain (loss), trading securities	$ (51)	$ 118	$ 228
Number of partnerships in alternative investment portfolio \| item	311	271
Alternative investments as a percentage of overall invested assets	2.00%	1.00%
Amortized cost	$ 105,177	$ 104,174
Fair Value	118,746	123,044
Net portion of OTTI recognized in OCI, pre-tax			$ 15
Fair value of collateral received that we are permitted to sell or re-pledge	22
Investment commitments	3,200
Investment commitments for limited partnerships	1,600
Investment commitments for mortgage loans on real estate	574
Investment commitments for private placements	$ 1,000
Minimum [Member]
Investments [Line Items]
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements	80.00%
Maximum [Member]
Investments [Line Items]
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements	95.00%
Federal Home Loan Mortgage Corporation [Member] \| Investments [Member]
Investments [Line Items]
Fair value	$ 953	$ 1,200
Concentration risk, percentage	1.00%	1.00%
Federal National Mortgage Association [Member] \| Investments [Member]
Investments [Line Items]
Fair value	$ 926	$ 1,000
Concentration risk, percentage	1.00%	1.00%
Consumer Non-Cyclical Industry [Member] \| Investments [Member]
Investments [Line Items]
Fair value	$ 19,600	$ 20,300
Concentration risk, percentage	13.00%	13.00%
Financial Service [Member] \| Investments [Member]
Investments [Line Items]
Fair value	$ 19,200	$ 19,600
Concentration risk, percentage	12.00%	13.00%
Corporate Bonds [Member]
Investments [Line Items]
Percentage of fair value rated as investment grade	96.00%	96.00%
Amortized cost of portfolio rated below investment grade	$ 3,700	$ 4,100
Fair value of portfolio rated below investment grade	$ 3,800	$ 4,200
Commercial [Member]
Investments [Line Items]
Number of impaired loans \| security	4
Impaired financing receivable, principal balance	$ 1
Commercial [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| California [Member]
Investments [Line Items]
Concentration risk, percentage	26.00%	24.00%
Commercial [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| Texas [Member]
Investments [Line Items]
Concentration risk, percentage	9.00%	10.00%
Residential [Member]
Investments [Line Items]
Number of loans past due \| loan	65	147
Number of impaired loans	50	76
Impaired financing receivable, principal balance	$ 22	$ 34
Number Of Loans In Foreclosure \| loan	34	75
Mortgage Loans in Process of Foreclosure, Amount	$ 15	$ 27
Residential [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| California [Member]
Investments [Line Items]
Concentration risk, percentage	22.00%	32.00%
Residential [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| Florida [Member]
Investments [Line Items]
Concentration risk, percentage	14.00%	18.00%

Alternative investments as a percentage of overall invested assets.

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This item represents the change in gross unrealized holding gain or loss on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

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Percentage of the fair value of portfolio that was rated investment grade as of balance sheet date.

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This item represents total investment commitments as of the balance sheet date for fixed maturity available-for-sale securities, limited partnerships, real estate and mortgage loans on real estate.

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Investments [Line Items]

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Number Of Loans In Foreclosure

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Number of partnerships represented in alternative investment portfolio.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Fair value of collateral permitted, by contact or custom, to be sold or re-pledged.

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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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Amount before tax of other than temporary impairment (OTTI) loss on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss.

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