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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total financial services and software subscriptions and services revenue	$ 572	$ 542	$ 1,652	$ 1,589
Revenue from other sources	144	101	415	270
Total fee income and other revenue	716	643	2,067	1,859
Retirement Deferred Group and Individual Annuity
Disaggregation of Revenue [Line Items]
Total financial services and software subscriptions and services revenue	189	163	542	463
Retirement Deferred Group and Individual Annuity | Distribution and shareholder servicing
Disaggregation of Revenue [Line Items]
Total financial services and software subscriptions and services revenue	35	34	97	100
Investment Management [Member]
Disaggregation of Revenue [Line Items]
Total financial services and software subscriptions and services revenue	255	248	730	732
Investment Management [Member] | Distribution and shareholder servicing
Disaggregation of Revenue [Line Items]
Total financial services and software subscriptions and services revenue	34	40	102	119
Employee Benefits [Member]
Disaggregation of Revenue [Line Items]
Total financial services and software subscriptions and services revenue	12	7	32	19
Benefitfocus
Disaggregation of Revenue [Line Items]
Total financial services and software subscriptions and services revenue	47	50	148	154
Corporate
Disaggregation of Revenue [Line Items]
Total financial services and software subscriptions and services revenue	$ 0	$ 0	$ 1	$ 2

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