Investments - Composition of US and Foreign Corporate Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Collateral Pledged
Available-for-sale Securities Including Securities Pledged [Line Items]
Securities Sold under Agreements to Repurchase, Asset	$ 0
Mortgage-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Percent Collateralized Mortgage Backed Securities including Interest-Only Strip or Principal-Only Strip	51.60%	46.90%
Communications
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	$ 915	$ 911
Gross Unrealized Capital Gains	15	8
Gross Unrealized Capital Losses	88	117
Fair Value	842	802
Financial
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	3,059	3,155
Gross Unrealized Capital Gains	27	16
Gross Unrealized Capital Losses	351	406
Fair Value	2,735	2,765
Industrial and other companies
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	6,174	6,344
Gross Unrealized Capital Gains	29	10
Gross Unrealized Capital Losses	611	774
Fair Value	5,592	5,580
Energy
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	1,497	1,486
Gross Unrealized Capital Gains	22	11
Gross Unrealized Capital Losses	104	131
Fair Value	1,415	1,366
Utilities
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	2,652	2,665
Gross Unrealized Capital Gains	18	9
Gross Unrealized Capital Losses	236	291
Fair Value	2,434	2,383
Transportation
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	881	915
Gross Unrealized Capital Gains	4	1
Gross Unrealized Capital Losses	78	100
Fair Value	807	816
Total
Available-for-sale Securities Including Securities Pledged [Line Items]
Amortized Cost	15,178	15,476
Gross Unrealized Capital Gains	115	55
Gross Unrealized Capital Losses	1,468	1,819
Fair Value	$ 13,825	$ 13,712

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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Amount 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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Amount of asset associated with funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price.

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Percent Collateralized Mortgage Backed Securities including Interest-Only Strip or Principal-Only Strip

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