Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Outstanding Balance	$ 13,727		$ 13,364
Fair Value	13,119		13,088
Asset Management
Debt Instrument [Line Items]
Outstanding Balance	5,895		5,516
Fair Value	5,846		5,590
Asset Management \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	5,762		5,516
Fair Value	5,713		5,590
Asset Management \| Two Thousand Twenty Seven Subordinated Notes \| Nonrecourse
Debt Instrument [Line Items]
Outstanding Balance	133		0
Fair Value	$ 133		$ 0
Asset Management \| Senior Notes \| 4.40%, 2026 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.40%		4.40%
Asset Management \| Senior Notes \| 4.40%, 2026 Senior Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 0		$ 500
Fair Value	$ 0		$ 500
Asset Management \| Senior Notes \| 4.87%, 2029 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.87%		4.87%
Asset Management \| Senior Notes \| 4.87%, 2029 Senior Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 675		$ 675
Fair Value	$ 676		$ 686
Asset Management \| Senior Notes \| 2.65% 2030 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.65%		2.65%
Asset Management \| Senior Notes \| 2.65% 2030 Senior Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 498		$ 497
Fair Value	$ 461		$ 464
Asset Management \| Senior Notes \| 4.60% 2031 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.60%		4.60%
Asset Management \| Senior Notes \| 4.60% 2031 Senior Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 396		$ 396
Fair Value	$ 395		$ 402
Asset Management \| Senior Notes \| 6.38% 2033 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.38%		6.38%
Asset Management \| Senior Notes \| 6.38% 2033 Senior Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 494		$ 493
Fair Value	$ 532		$ 550
Asset Management \| Senior Notes \| 5.15% 2035 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.15%		5.15%
Asset Management \| Senior Notes \| 5.15% 2035 Senior Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 839		$ 839
Fair Value	$ 826		$ 853
Asset Management \| Senior Notes \| 5.70% 2036 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.70%	5.70%	5.70%
Asset Management \| Senior Notes \| 5.70% 2036 Senior Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 744		$ 0
Fair Value	$ 753		$ 0
Asset Management \| Senior Notes \| 5.00%, 2048 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.00%		5.00%
Asset Management \| Senior Notes \| 5.00%, 2048 Senior Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 297		$ 297
Fair Value	$ 261		$ 273
Asset Management \| Senior Notes \| 6.25% 2054 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.80%		5.80%
Asset Management \| Senior Notes \| 6.25% 2054 Senior Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 741		$ 741
Fair Value	$ 712		$ 738
Asset Management \| Subordinated Notes \| 7.63% 2053 Subordinated Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	7.63%		7.63%
Asset Management \| Subordinated Notes \| 7.63% 2053 Subordinated Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 585		$ 585
Fair Value	$ 612		$ 628
Asset Management \| Subordinated Notes \| 6.63% 2054 Subordinated Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.00%		6.00%
Asset Management \| Subordinated Notes \| 6.63% 2054 Subordinated Notes \| Recourse
Debt Instrument [Line Items]
Outstanding Balance	$ 493		$ 493
Fair Value	485		496
Retirement Services
Debt Instrument [Line Items]
Outstanding Balance	7,832		7,848
Fair Value	$ 7,273		$ 7,498
Retirement Services \| Senior Notes \| 4.13% 2028 Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.13%		4.13%
Outstanding Balance	$ 1,026		$ 1,034
Fair Value	$ 991		$ 999
Retirement Services \| Senior Notes \| 6.15% 2030 Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.15%		6.15%
Outstanding Balance	$ 558		$ 565
Fair Value	$ 518		$ 531
Retirement Services \| Senior Notes \| 3.50% 2031 Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.50%		3.50%
Outstanding Balance	$ 515		$ 517
Fair Value	$ 469		$ 473
Retirement Services \| Senior Notes \| 6.65% 2033 Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.65%		6.65%
Outstanding Balance	$ 396		$ 396
Fair Value	$ 423		$ 434
Retirement Services \| Senior Notes \| 5.88% 2034 Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.88%		5.88%
Outstanding Balance	$ 586		$ 585
Fair Value	$ 607		$ 623
Retirement Services \| Senior Notes \| 3.95% 2051 Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.95%		3.95%
Outstanding Balance	$ 543		$ 543
Fair Value	$ 343		$ 351
Retirement Services \| Senior Notes \| 3.45% 2052 Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.45%		3.45%
Outstanding Balance	$ 504		$ 504
Fair Value	$ 313		$ 317
Retirement Services \| Senior Notes \| 6.25% 2054 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.25%		6.25%
Outstanding Balance	$ 983		$ 983
Fair Value	$ 921		$ 975
Retirement Services \| Senior Notes \| 6.63% 2055 Senior Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.63%		6.63%
Outstanding Balance	$ 979		$ 979
Fair Value	$ 972		$ 1,019
Retirement Services \| Subordinated Notes \| 6.63% 2054 Subordinated Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.63%		6.63%
Outstanding Balance	$ 592		$ 592
Fair Value	$ 576		$ 600
Retirement Services \| Subordinated Notes \| 6.88% 2055 Subordinated Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.88%		6.88%
Outstanding Balance	$ 592		$ 592
Fair Value	$ 576		$ 600
Retirement Services \| Subordinated Notes \| 7.25% 2064 Subordinated Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	7.25%		7.25%
Outstanding Balance	$ 558		$ 558
Fair Value	$ 564		$ 576