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Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Employer contribution match, percent match		100.00%
Employer contribution match, percentage of employee contribution		6.00%
Defined contributions plan expense		$ 14	$ 13	$ 11
Cost or expenses included in compensation and benefit expense		22	21	23
Employer contribution amount	$ 22
Plan funded percentage	100.00%
Funded status, underfunded amount		28	60	$ 59
Fair value of plan assets		94	79
Benefit obligation		122	$ 139
Accumulated other comprehensive loss for benefit plan		22
Unrecognized net loss		28
Income tax benefit		$ 6

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

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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