Supplemental Financial Information - Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Cash flow disclosures
Tax expense (benefit) on gain or loss on sale of business	$ 430
Tax expense (benefit) from resolution of various tax positions related to prior years		$ (390)
Taxes paid related to disposal group		125
Cash impact from foreign currency loss	65	(368)
Venezuela
Cash flow disclosures
Cash impact from foreign currency loss		(405)
Defined Benefit Plans
Cash flow disclosures
Company contributions	283	491
Medical and Dental Plans
Cash flow disclosures
Company contributions	$ 11	$ 9

Amount of cash paid for income taxes related to disposal groups.

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Amount of contributions made by the employer to defined benefit plans.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the disposition of a business not qualifying as a discontinued operation.

+ References

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

+ References

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