Business and Summary of Significant Accounting Policies - Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Numerator:
Net income	$ 150	$ 156
Less: Net (loss) income attributable to noncontrolling interests	(1)	0
Net income attributable to our common shareholder	$ 151	$ 156
Denominator:
Weighted average common shares outstanding - basic (in shares)	600,000,000	600,000,000
Weighted average common shares outstanding - diluted (in shares)	600,000,000	600,000,000
Earnings per share - basic
Attributable to our common shareholder, basic (in dollars per share)	$ 0.25	$ 0.26
Earnings per share - diluted
Attributable to our common shareholder, diluted (in dollars per share)	$ 0.25	$ 0.26