Fair Value - Schedule of Financial Instruments Not Measured at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 7,536	$ 5,467
Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	3,660	2,893
Carrying Value \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	109	79
Policy loans	334	347
Funds withheld at interest	27,738
Short-term investments		1,640
Other investments	46	162
Total Assets – Asset Management	36,919	51,798
Interest sensitive contract liabilities	154,095	125,101
Debt	4,209	3,658
Securities to repurchase	3,853	4,743
Funds withheld liability	350	360
Total financial liabilities not carried at fair value	162,507	133,862
Carrying Value \| Related Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	550	610
Funds withheld at interest	7,195	11,233
Short-term investments	947
Carrying Value \| Nonrelated Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Funds withheld at interest		37,727
Fair Value \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	109	79
Policy loans	334	347
Funds withheld at interest	27,738
Short-term investments		1,640
Other investments	52	162
Total Assets – Asset Management	36,925	51,798
Interest sensitive contract liabilities	146,038	111,608
Debt	3,660	2,893
Securities to repurchase	3,853	4,743
Funds withheld liability	350	360
Total financial liabilities not carried at fair value	153,901	119,604
Fair Value \| Related Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	550	610
Funds withheld at interest	7,195	11,233
Short-term investments	947
Fair Value \| Nonrelated Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Funds withheld at interest		37,727
Fair Value \| NAV \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	109	79
Policy loans	0	0
Funds withheld at interest	0
Short-term investments		0
Other investments	0	0
Total Assets – Asset Management	659	689
Interest sensitive contract liabilities	0	0
Debt	0	0
Securities to repurchase	0	0
Funds withheld liability	0	0
Total financial liabilities not carried at fair value	0	0
Fair Value \| NAV \| Related Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	550	610
Funds withheld at interest	0	0
Short-term investments	0
Fair Value \| NAV \| Nonrelated Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Funds withheld at interest		0
Fair Value \| Level 1 \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	0	0
Policy loans	0	0
Funds withheld at interest	0
Short-term investments		0
Other investments	0	0
Total Assets – Asset Management	0	0
Interest sensitive contract liabilities	0	0
Debt	0	0
Securities to repurchase	0	0
Funds withheld liability	0	0
Total financial liabilities not carried at fair value	0	0
Fair Value \| Level 1 \| Related Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	0	0
Funds withheld at interest	0	0
Short-term investments	0
Fair Value \| Level 1 \| Nonrelated Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Funds withheld at interest		0
Fair Value \| Level 2 \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	0	0
Policy loans	334	347
Funds withheld at interest	0
Short-term investments		1,614
Other investments	0	0
Total Assets – Asset Management	1,281	1,961
Interest sensitive contract liabilities	0	0
Debt	3,660	2,893
Securities to repurchase	3,853	4,743
Funds withheld liability	350	360
Total financial liabilities not carried at fair value	7,863	7,996
Fair Value \| Level 2 \| Related Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	0	0
Funds withheld at interest	0	0
Short-term investments	947
Fair Value \| Level 2 \| Nonrelated Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Funds withheld at interest		0
Fair Value \| Level 3 \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	0	0
Policy loans	0	0
Funds withheld at interest	27,738
Short-term investments		26
Other investments	52	162
Total Assets – Asset Management	34,985	49,148
Interest sensitive contract liabilities	146,038	111,608
Debt	0	0
Securities to repurchase	0	0
Funds withheld liability	0	0
Total financial liabilities not carried at fair value	146,038	111,608
Fair Value \| Level 3 \| Related Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds	0	0
Funds withheld at interest	7,195	11,233
Short-term investments	$ 0
Fair Value \| Level 3 \| Nonrelated Party \| Retirement Services
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Funds withheld at interest		$ 37,727

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Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

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