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Summary of Significant Accounting Policies - Other Balance Sheet Information (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Accounts receivable allowance for doubtful accounts	$ 57	$ 32
Property, plant and equipment accumulated depreciation	1,759	1,811
Intangible assets accumulated amortization	1,215	1,149
Out-of-market contracts accumulated amortization	$ 0	$ 37

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Accumulated Amortization of Out of Market Contracts

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
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-Section 50
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Amount of allowance for credit loss on accounts receivable, classified as current.

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