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Benefit Plans (Activity of plan assets with significant unobservable fair value inputs) (Details) (Alternative Investments [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	$ 98	$ 99	$ 124
Actual return on plan assets	11	7	9
Purchases, sales and settlements	(8)	(8)	(34)
Fair value of plan assets, end of year	$ 101	$ 98	$ 99

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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