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Pension And Profit Sharing Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Non-Qualified Pension Expense [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension expense	$ 2	$ 2	$ 3
Non-Qualified Profit-Sharing/401(k) Expense [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension expense	1	1	1
Defined Contribution Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution percentage of eligible employees compensation	10.00%
Vested after two years	20.00%
Vested after three years	60.00%
Vested after four years	80.00%
Vested after five years	100.00%
Pension expense	7	6	7
Qualified Profit-Sharing/401(k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Vested after two years	20.00%
Vested after three years	60.00%
Vested after four years	80.00%
Vested after five years	100.00%
Pension expense	$ 3	$ 4	$ 3
Qualified Profit-Sharing/401(k) Plan [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution percentage of eligible employees compensation	25.00%
Company match of employee contributions	5.00%

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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