Stock Incentive Plans - Stock Option and SAR Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from stock options exercised (including ESPP)	$ 277,000	$ 551,000	$ 549,000
Payments for taxes for net share settlement of equity awards	181,000	370,000	168,000
Stock options and stock appreciation rights (“SARs”)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from stock options exercised (including ESPP)	277,000	551,000	549,000
Payments for taxes for net share settlement of equity awards	181,000	370,000	168,000
Intrinsic value of stock options and SARs exercised	31,000	118,000	105,000
Fair value of stock options and SARs vested	$ 227,000	$ 219,000	$ 224,000
Shares
Shares, Outstanding at beginning of year (in shares)	15,040
Shares granted (in shares)	4,595
Shares exercised (in shares)	(1,652)
Shares forfeited (in shares)	(624)
Shares expired (in shares)	(2,233)
Shares, Outstanding at end of year (in shares)	15,126	15,040
Weighted Average Exercise  Price
Outstanding at beginning of year (in dollars per share)	$ 73.15
Granted (in dollars per share)	63.06
Exercised (in dollars per share)	50.03
Forfeited (in dollars per share)	76.74
Expired (in dollars per share)	102.47
Outstanding at end of year (in dollars per share)	$ 68.13	$ 73.15
Additional Disclosures
Weighted average contractual term, outstanding at end of year	5 years 2 months 15 days
Aggregate Intrinsic value outstanding at end of year	$ 203,645
Shares exercisable at end of year (in shares)	7,785
Weighted average exercise price exercisable at end of year (in dollars per share)	$ 63.64
Weighted average remaining contractual term exercisable at end of year	3 years 4 months 6 days
Aggregate intrinsic value exercisable at end of year	$ 130,509
Shares vested at end of year and expected to vest in the future (in shares)	14,793
Weighted average exercise price vested at end of year and expected to vest in the future (in dollars per share)	$ 67.95
Weighted average remaining contractual term vested at end of year and expected to vest in the future	5 years 1 month 20 days
Aggregate intrinsic value vested at end of year and expected to vest in the future	$ 201,439
Employee Stock Option | Signify Health, Inc.
Shares
Shares granted (in shares)	1,400