XML 82 R90.htm IDEA: XBRL DOCUMENT

Retirement Benefits (Fair Values Of Company's Other Postretirement Benefit Plan Assets) (Detail) (Other Postretirement Benefit Plans [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 211	$ 205	$ 234
Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	4
Unitized Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	202	201
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	4
Level 1 [Member] \| Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	4
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	202	201
Level 2 [Member] \| Unitized Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 202	$ 201

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.

+ References+ Details