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Postretirement Benefits (Details 8) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 participant	Dec. 31, 2013 participant
Amounts recognized in other comprehensive income for pension plans:
Net actuarial loss (gain) arising during the year	$ 98	$ (110)
Amortization of net actuarial loss	(6)	(15)
Amortization of prior service cost	(1)	(1)
Amendments	0	1
Total recognized in other comprehensive income	$ 91	$ (125)
Number of new plan participants resulting in charges recognized as amendments (number of participants)	4	4

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.

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- 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