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Benefit Plans (Schedule of amounts recognized in Other comprehensive income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Amounts arising during the period	$ (337)	$ 422	$ (195)
Curtailment and other	(81)	0	0
Settlement	84	0	0
Reclassification adjustment relating to prior service cost (credit)	(10)	(18)	(18)
Reclassification adjustment relating to actuarial (gain) loss	26	49	40
Total increase (decrease) in Other comprehensive income	$ (318)	$ 453	$ (173)

Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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- Definition

Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

+ References+ Details

- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

+ References+ Details