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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Non-Controlling Interests (Details) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Jul. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019
Freight Holding
Noncontrolling Interest [Line Items]
Ownership percentage in non-controlling interest		89.00%		89.00%
Diluted ownership percentage in non-controlling interest		80.00%		80.00%
Number of shares reserved and available for grant and issuance (in shares) \| shares		99.8
ATG and Other Technology Programs collaboration revenue
Noncontrolling Interest [Line Items]
Revenue recognized from redeemable non-controlling interest		$ 25	$ 0
Apparate \| Volatility \| Level 3
Noncontrolling Interest [Line Items]
Unobservable measurement input		0.57
Apparate \| Time to Liquidity \| Level 3
Noncontrolling Interest [Line Items]
Unobservable measurement input		4 years 3 months 18 days
Apparate \| Discount for Lack of Marketability \| Level 3
Noncontrolling Interest [Line Items]
Unobservable measurement input		0.19
ATG Investment \| Apparate
Noncontrolling Interest [Line Items]
Sale of stock, percentage of ownership after transaction		86.10%
ATG Investment \| Apparate
Noncontrolling Interest [Line Items]
Proceeds from issuance of common stock	$ 1,000
Term of agreement	3 years
Semi-annual installment received		$ 50
ATG Investment \| Apparate \| ATG and Other Technology Programs collaboration revenue
Noncontrolling Interest [Line Items]
Revenue recognized from redeemable non-controlling interest		$ 25
ATG Investment \| Apparate \| Toyota
Noncontrolling Interest [Line Items]
Proceeds from issuance of common stock	$ 400
ATG Investment \| Apparate \| Softbank
Noncontrolling Interest [Line Items]
Proceeds from issuance of common stock	333
ATG Investment \| Apparate \| DENSO
Noncontrolling Interest [Line Items]
Proceeds from issuance of common stock	$ 267
Preferred Class A \| ATG Investment
Noncontrolling Interest [Line Items]
Sale of stock, percentage of ownership after transaction		13.90%
Preferred Class A \| ATG Investment \| Apparate
Noncontrolling Interest [Line Items]
Stock issued during period (in shares) \| shares	1.0
Preferred stock units issued (in dollars per share) \| $ / shares	$ 1,000