Supplemental Balance Sheet Information (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($) days	Dec. 31, 2018 USD ($)
Accounts and Notes Receivable [Abstract]
Number of days from the period in which the corresponding sales occur that trade receivables are generally due \| days	30
Accounts and notes receivable, gross	$ 584	$ 592
Allowance for doubtful accounts	(41)	(31)
Accounts and notes receivable, net	$ 543	$ 561

The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3,4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_AccountsNotesAndLoansReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant