Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Rate of employee contribution from earnings		80.00%
Matching contribution allocation rate first time		100.00%
Employee contribution rate for first time matching		3.00%
Matching contribution allocation rate second time		50.00%
Employees contribution rate for second time matching		3.00%
Employer contribution in common stock		$ 32	$ 31	$ 33
Minimum range of eligible compensation for noncontributory profit sharing feature		0.00%
Maximum range of eligible compensation for noncontributory profit sharing feature		3.50%
Accrued profit sharing expense		$ 24	7	16
Pension
Defined Benefit Plan Disclosure [Line Items]
One-time expense	$ (28)	0	(28)	$ (1)
Supplemental Retirement
Defined Benefit Plan Disclosure [Line Items]
Benefit liability		$ 4	$ 5