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Marketable securities | 6 Months Ended
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Jun. 30, 2021
Marketable Securities [Abstract] |
Marketable securities | Marketable securities We hold investments in certain marketable securities which we record at fair value through profit and loss. We use quoted market prices to determine the fair value of our marketable securities and categorize them as level 1 on the fair value hierarchy. The below table shows the carrying value of our investments in marketable securities for periods presented in this report.
(In $ millions) |  | As at June 30, 2021 |  | As at December 31, 2020 |
Archer |  | 13 |  |  | 8 |  |
Total marketable securities |  | 13 |  |  | 8 |  |
The below table shows the gain and losses recognized through net loss for the periods presented in this report.
(In $ millions) |  |  |  |  |  | Six months ended June 30, 2021 |  | Six months ended June 30, 2020
Seadrill Partners - Common units - unrealized loss on marketable securities |  |  |  |  |  | — |  |  | (2) |
Archer - unrealized gain / (loss) on marketable securities |  |  |  |  |  | 5 |  |  | (4) |
Total unrealized gain / (loss) on marketable securities |  |  |  |  |  | 5 |  |  | (6) |
For information on our previous investment in Seadrill Partners, refer to Note 10 - "Loss on impairment of equity method investments". There was no gain or loss on the cancellation of Seadrill Partners ownership interests as these investments have a nil book value.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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