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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 656us-gaap_NetIncomeLoss	$ 487us-gaap_NetIncomeLoss
Net actuarial gains (losses) of defined benefit plans:
Adjustments	(10)	(2)
Recognized within Net income	10	10
Prior service cost of defined benefit plans:
Recognized within Net income	1	0
Other comprehensive income (loss)	1	8
Total comprehensive income	$ 657us-gaap_ComprehensiveIncomeNetOfTax	$ 495us-gaap_ComprehensiveIncomeNetOfTax

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

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

+ References+ Details