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Revenue (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Receivables		$ 10,500		$ 9,800
Includes excise, value-added and similar taxes			$ 1,677
Performance obligation		30 days
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Taxes other than on income	[1]	$ 1,344	$ 2,871
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Taxes other than on income		$ 1,900
[1] 2017 includes excise, value-added and similar taxes of $1,677 million collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with ASU 2014-09. Refer to Note 17, "Revenue" beginning on page 24.

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

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+ References

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