v3.22.0.1

Debt (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Convertible Notes Payable [Abstract] |
Convertible Debt | The following table summarizes the carrying value of our outstanding debt (in millions, except percentages):
| December 31, 2021 |  | December 31, 2020
| 2030 Notes |  | 2022 Notes |  | 2030 Notes |  | 2022 Notes
Current, net of unamortized debt discount and issuance costs of $2 million | $ | — |  |  | $ | 92 |  |  | $ | — |  |  | $ | — |
Long-term, net of unamortized debt discount and issuance costs of $16 million and $29 million, respectively | 1,484 |  |  | — |  |  | 1,482 |  |  | 158 |
Total debt | $ | 1,484 |  |  | $ | 92 |  |  | $ | 1,482 |  |  | $ | 158 |
Effective interest rate of the liability component - 2022 Notes | 4.75%
Effective interest rate - 2030 Notes | 1.53%
| Convertible Date |  | Initial Conversion Price per Share |  | Initial Conversion Rate per $1,000 Par Value |  | Initial Number of Shares
|  |  |  |  |  |  | (in millions)
2022 Notes | February 1, 2022 |  | $ | 134.75 |  |  | 7.42 shares |  | 6 |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The estimated fair value of the 2030 Notes and 2022 Notes at December 31, 2021 and December 31, 2020 based on the closing trading price per $100 of the 2030 Notes and 2022 Notes were as follows (in millions):
| December 31, 2021 |  | December 31, 2020
2022 Notes | $ | 440 |  |  | $ | 687 |
2030 Notes | $ | 1,400 |  |  | $ | 1,463 |
Schedule of Note Hedge Transactions |
| Purchase |  | Initial Shares |  | Shares as of December 31, 2021
| (in millions)
2022 Note Hedge | $ | 128 |  |  | 6 |  |  | 1 |
Schedule of Warrants |
| Proceeds |  | Initial Shares |  | Strike Price |  | First Expiration Date |  | Shares as of December 31, 2021
| (in millions) |  | (in millions) |  |  |  |  |  | (in millions)
2022 Warrants | $ | 54 |  |  | 6 |  |  | $ | 203.40 |  |  | September 1, 2022 |  | 1 |

X
- Definition Schedule Of Note Hedge Transactions [Table Text Block] + References No definition available. + Details
Name: | now_ScheduleOfNoteHedgeTransactionsTableTextBlock
Namespace Prefix: | now_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
Name: | us-gaap_ConvertibleDebtTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ConvertibleLongtermNotesPayableCurrentAndNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
Name: | us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration