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Basis of Presentation and Summary of Significant Accounting Policies (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	0 Months Ended
	Mar. 31, 2012	Dec. 31, 2012	Apr. 02, 2012 Office building
Basis of presentation
Tax benefit associated with deduction for pension funding recognized in equity contribution	$ 100	$ 100
Net proceeds from sale of office building			133
Amount of gain from sale of office building deferred			$ 16
Lease term			10 years

The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller less the costs incurred in connection with the transaction, such as closing and deferred financing costs.

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