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Employee Benefit Plans - Plan's Assets Carried at Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	$ 517	$ 419
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	204	212
Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	139	100
Other Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	174	107
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	417	342
Fair Value, Inputs, Level 2 [Member] \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	204	212
Fair Value, Inputs, Level 2 [Member] \| Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	139	100
Fair Value, Inputs, Level 2 [Member] \| Other Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	74	30
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	100	77	32
Fair Value, Inputs, Level 3 [Member] \| Other Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurements	$ 100	$ 77

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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