Long-Term Incentive Compensation (Narrative) (Details) - USD ($)	3 Months Ended					12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	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						$ 30,000,000	$ 30,000,000	$ 17,000,000
Number of options, granted (in shares)						0	0	0
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)						(1,000,000)	1,000,000	0
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						$ 1,000,000	2,000,000	3,000,000
Increase (decrease) in deferred tax asset (liability)						1,000,000	1,000,000	2,000,000
Equity-classified awards, unrecognized compensation cost						$ 1,000,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition						9 months 18 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	$ 6,000,000
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
Long-term incentive compensation – expensed						$ 1,000,000	$ 0	$ 0
Increase (decrease) in deferred tax asset (liability)						3,000,000	$ 2,000,000	$ 1,000,000
Equity-classified awards, unrecognized compensation cost						$ 4,000,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition						2 years 1 month 6 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						$ 2,000,000	$ 0	$ 0
Equity-classified awards, unrecognized compensation cost						$ 5,000,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition						1 year 9 months 18 days
Liability-Classified RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase (decrease) in deferred tax asset (liability)						$ (1,000,000)	$ 1,000,000	1,000,000
Liability-classified restricted stock, vesting period	4 years	4 years	4 years	4 years	4 years		3 years
Liability-classified restricted stock, unrecognized compensation cost						$ 8,000,000
Liability-classified restricted stock, weighted average period over which unrecognized cost is recognized, years						1 year
Liability-Classified Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase (decrease) in deferred tax asset (liability)						$ 4,000,000	$ 4,000,000	$ (2,000,000)
Liability-classified performance units, vesting period						3 years	3 years	3 years	3 years	3 years
Liability-classified performance units, unrecognized compensation cost						$ 7,000,000
Liability-classified performance units, weighted average period over which unrecognized cost is recognized, years						1 year 6 months
Performance cash awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for stock awards from grant date						4 years	4 years	4 years
Long-term incentive compensation – expensed						$ 6,000,000	$ 4,000,000	$ 2,000,000
Increase (decrease) in deferred tax asset (liability)						1,000,000	$ 1,000,000	$ 1,000,000
Liability-classified restricted stock, unrecognized compensation cost						$ 29,000,000
Liability-classified restricted stock, weighted average period over which unrecognized cost is recognized, years						2 years 9 months 18 days
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