Equity - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended												6 Months Ended			9 Months Ended			12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Payments relating to treasury shares (in shares)																			1,000	1,000	1,000
Stock repurchase program, authorized amount	$ 3,150.0																		$ 3,150.0
Repurchases of common stock (in shares)	1,834	0	0	0	0	1,576	4,384	7,643	3,661	3,730	4,170	5,871	0	12,027	10,041	0	13,603	13,771	1,834	13,603	17,432
Repurchases of common stock	$ 250.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 148.0	$ 400.0	$ 699.0	$ 340.0	$ 340.0	$ 340.0	$ 440.0							$ 250.0	$ 1,247.0	$ 1,460.0
Amount remaining to be repurchased	$ 903.0	$ 0.0	$ 0.0	$ 0.0	$ 1,153.0	$ 1,153.0	$ 1,301.0	$ 1,701.0	$ 540.0	$ 880.0	$ 1,220.0	$ 1,560.0	$ 0.0	$ 1,301.0	$ 1,220.0	$ 0.0	$ 1,153.0	$ 880.0	$ 903.0	$ 1,153.0	$ 540.0