Goodwill and Other Intangible Assets - Other Intangible Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2018
Finite-lived Intangible Assets [Roll Forward]
Other intangible assets balance at December 31, 2017		$ 10,269
Acquisitions		435
Foreign currency translation		(25)
Amortization of other intangible assets		(215)
Other activity, net		(19)
Other intangible assets balance at September 30, 2018	$ 10,445	10,445
Amortization of other intangible assets	$ 4	$ 4

Intangible Assets Excluding Goodwill Acquired

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- Definition

Intangible Assets Excluding Goodwill, Adjustments, Discontinued Operations

+ References

No definition available.

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- Definition

Intangible Assets Excluding Goodwill, Translation Adjustments

+ References

No definition available.

+ Details

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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