Long-Term Incentive Compensation (Narrative) (Details) - USD ($)	3 Months Ended						12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive compensation – expensed							$ 23,000,000	$ 30,000,000	$ 30,000,000
Number of options, granted (in shares)							0	0	0
Liability-classified performance units, vesting period							3 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for stock awards from grant date							3 years
Expiration period from date of grant							10 years
Long-term incentive compensation – expensed							$ 0	$ 0	$ 0
Increase (decrease) in deferred tax asset (liability) (less than)							1,000,000	1,000,000	(1,000,000)
Equity-classified awards, unrecognized compensation cost							$ 0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for stock awards from grant date							3 years
Long-term incentive compensation – expensed							$ 2,000,000	1,000,000	2,000,000
Increase (decrease) in deferred tax asset (liability) (less than)								(1,000,000)	(1,000,000)
Equity-classified awards, unrecognized compensation cost							$ 1,000,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition							4 months 24 days
Total fair value of restricted stock grants							$ 2,000,000	$ 2,000,000	2,000,000
Total fair value of shares vested							$ 2,000,000		$ 5,000,000
Performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for stock awards from grant date							3 years	3 years	3 years	3 years	3 years	3 years
Long-term incentive compensation – expensed							$ 2,000,000	$ 1,000,000	$ 0
Increase (decrease) in deferred tax asset (liability) (less than)							(3,000,000)	$ (3,000,000)	$ (2,000,000)
Equity-classified awards, unrecognized compensation cost							$ 6,000,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition							1 year 9 months 18 days
Performance units | Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for stock awards from grant date							3 years	3 years	3 years
Equity-Classified Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive compensation – expensed							$ 5,000,000	$ 2,000,000	$ 0
Equity-classified awards, unrecognized compensation cost							$ 6,000,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition							1 year 6 months
Liability-Classified RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase (decrease) in deferred tax asset (liability) (less than)							$ 1,000,000		$ (1,000,000)
Liability-classified restricted stock, vesting period	4 years	4 years	4 years	4 years	4 years	4 years			3 years
Liability-classified restricted stock, unrecognized compensation cost							$ 1,000,000
Liability-classified restricted stock, weighted average period over which unrecognized cost is recognized, years							2 months 12 days
Liability-Classified Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase (decrease) in deferred tax asset (liability) (less than)							$ (1,000,000)	$ (4,000,000)	$ (4,000,000)
Liability-classified performance units, unrecognized compensation cost							$ 4,000,000
Liability-classified performance units, weighted average period over which unrecognized cost is recognized, years							1 year 10 months 24 days
Performance cash awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for stock awards from grant date							3 years	4 years	4 years	4 years
Long-term incentive compensation – expensed							$ 9,000,000	$ 6,000,000	$ 4,000,000
Increase (decrease) in deferred tax asset (liability) (less than)							(1,000,000)	$ (1,000,000)	$ (1,000,000)
Liability-classified restricted stock, unrecognized compensation cost							$ 33,000,000
Liability-classified restricted stock, weighted average period over which unrecognized cost is recognized, years							2 years
2022 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares							40,000,000
Stock Based Compensation 2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of service for immediate vesting upon death, disability or retirement							3 years