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Retirement Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contribution match, percent match	100.00%	100.00%	100.00%
Employer contribution match, percentage of employee contribution	6.00%	6.00%	6.00%
Service plan expense	$ 17,000,000	$ 14,000,000	$ 14,000,000
Retirement plans expense	24,000,000	26,000,000	$ 23,000,000
Accumulated other comprehensive loss for benefit plan	23,000,000
Unrecognized net loss	28,000,000
Income tax benefit	5,000,000
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	79,000,000	111,000,000
Benefit obligation	81,000,000	112,000,000
Funded status, funded (underfunded) amount	(2,000,000)	(1,000,000)
Employer contributions	0	0
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status, funded (underfunded) amount	$ (28,000,000)	$ (34,000,000)

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Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), Tax Expense (Benefit)

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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