Basis of Presentation - Effects of Adoption of ASU 2018-12, Stockholders' Equity (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity	$ 15,470	$ 15,314	$ 15,201	$ 15,714	$ 16,576	$ 17,471
As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			15,478		17,695	19,175
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity	(3,160)	(3,062)	(3,320)	(2,913)	(2,216)	(1,320)	$ (1,516)
Accumulated Other Comprehensive Income (Loss) | As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			(3,284)		(1,251)	186	581
Accumulated Other Comprehensive Income (Loss) | De-recognition of shadow reserves
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity							2,331
Accumulated Other Comprehensive Income (Loss) | Re-measurement of LFPB using an upper-medium grade fixed income instrument yield discount rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity							(4,428)
Accumulated Other Comprehensive Income (Loss) | Other adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity	15,637	15,293	14,931	15,210	15,059	14,754	14,145
Retained Earnings | As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			15,144		15,097	14,776	14,150
Retained Earnings | De-recognition of shadow reserves
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity
Retained Earnings | Re-measurement of LFPB using an upper-medium grade fixed income instrument yield discount rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity
Retained Earnings | Other adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity							(5)
Noncontrolling Interests
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity	$ 867	$ 863	852	$ 932	1,004	1,153	1,077
Noncontrolling Interests | As Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			$ 880		$ 1,120	$ 1,329	1,321
Noncontrolling Interests | De-recognition of shadow reserves
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity							270
Noncontrolling Interests | Re-measurement of LFPB using an upper-medium grade fixed income instrument yield discount rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity							(513)
Noncontrolling Interests | Other adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity							$ (1)