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Accumulated Other Comprehensive Income (Loss) (Summary of the Components of Accumulated Other Comprehensive Income (Loss) and Detail on Reclassifications) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amounts reclassified from accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), Beginning Balance	$ (653)	$ (531)	$ 37
Other comprehensive income (loss) before reclassification	(403)	(234)	(606)
Actuarial losses and settlements	61	112	38
Net current period other comprehensive loss	(342)	(122)	(568)
Accumulated other comprehensive income (loss), Ending Balance	(995)	(653)	(531)
Defined Benefit Plans
Amounts reclassified from accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), Beginning Balance	(662)	(696)	(404)
Other comprehensive income (loss) before reclassification	(112)	(78)	(330)
Actuarial losses and settlements	61	112	38
Net current period other comprehensive loss	(51)	34	(292)
Accumulated other comprehensive income (loss), Ending Balance	(713)	(662)	(696)
Foreign Currency Translation
Amounts reclassified from accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), Beginning Balance	11	167	443
Other comprehensive income (loss) before reclassification	(296)	(156)	(276)
Actuarial losses and settlements	0	0	0
Net current period other comprehensive loss	(296)	(156)	(276)
Accumulated other comprehensive income (loss), Ending Balance	(285)	11	167
Hedging
Amounts reclassified from accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss), Beginning Balance	(2)	(2)	(2)
Other comprehensive income (loss) before reclassification	5	0	0
Actuarial losses and settlements	0	0	0
Net current period other comprehensive loss	5	0	0
Accumulated other comprehensive income (loss), Ending Balance	$ 3	$ (2)	$ (2)

X

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

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-Name Accounting Standards Codification
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-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

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