Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	May 20, 2026	Nov. 30, 2024	Nov. 30, 2021
Class of Stock [Line Items]
Stock repurchase program, authorized amount							$ 20,000.0	$ 10,000.0	$ 5,000.0
Stock repurchased during period (in shares)					12.8
Stock repurchased during period, value					$ 1,696.0
Stock repurchase program, remaining authorized repurchase amount, value		$ 11,700.0			11,700.0
Estimated federal excise taxes					$ 16.7
Common stock dividends declared (in USD per share)		$ 1.02	$ 1.02	$ 1.995	$ 2.04	$ 2.97
Forecast
Class of Stock [Line Items]
Common stock dividends declared (in USD per share)	$ 1.02