Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Glossary Prior Service Cost

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The amount that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Benefit Obligations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Postretirement Benefits [Member]	Jun. 30, 2013 Postretirement Benefits [Member]	Jun. 30, 2014 Postretirement Benefits [Member]	Jun. 30, 2013 Postretirement Benefits [Member]	Jun. 30, 2014 Postretirement Benefits [Member] UNITED STATES	Jun. 30, 2014 Postretirement Benefits [Member] UNITED STATES	Dec. 31, 2013 Postretirement Benefits [Member] UNITED STATES	Mar. 27, 2014 Narrows Union Employees [Member] Postretirement Benefits [Member] UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Prior service cost credit								$ 92	$ (5)
Amortization of prior service cost (credit)		(22)	0	(41)	0	(21)	(41)
Lump-sum buyout payments						1	31
Contributions to multiemployer defined benefit plan	$ 4