Investments (excluding Consolidated Investment Entities) - Loans by Debt Service Coverage Ratio (Details) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 210	$ 968
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	975	345
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	341	293
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	272	588
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	553	466
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	3,313	2,948
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 5,664	$ 5,608
>1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Debt Service Coverage Ratio, minimum	1.5	1.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 89	$ 736
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	730	161
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	167	168
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	164	337
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	347	313
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,471	2,207
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 3,968	$ 3,922
>1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Debt Service Coverage Ratio, minimum	1.25	1.25
Debt Service Coverage Ratio, maximum	1.5	1.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 93	$ 150
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	136	129
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	100	34
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	33	116
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	99	20
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	403	402
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 864	$ 851
>1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Debt Service Coverage Ratio, minimum	1.0	1.0
Debt Service Coverage Ratio, maximum	1.25	1.25
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 28	$ 67
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	68	49
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	46	89
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	73	48
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	28	48
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	295	245
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 538	$ 546
Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Debt Service Coverage Ratio, maximum	1.0	1.0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 0	$ 15
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	41	6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	28	2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2	87
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	79	85
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	144	94
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 294	$ 289

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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