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Revenue from Contracts with Customers (Tables)
6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of contract assets and contract liabilities from contracts with customers
The following table provides information about receivables and contract liabilities from our contracts with customers:
(In $ millions)As at June 30, 2021 As at December 31,
2020
Accounts receivable, net122 125 
Current contract liabilities (deferred revenue) (1)
(24)(18)
Non-current contract liabilities (deferred revenue) (2)
(7)(13)

(1)  Current contract liabilities balances are included in “Other current liabilities” in our Consolidated Balance Sheet.
(2) Non-current contract liabilities balances are included in “Other non-current liabilities” in our Consolidated Balance Sheet.

Significant changes in the contract assets and the contract liabilities balances during the six months ended June 30, 2020 are as follows:
(In $ millions)  Contract AssetsContract LiabilitiesNet Contract
Balances
Net contract liability at January 1, 2020   (29)(29)
Amortization of revenue that was included in the beginning contract liability balance  — 15 15 
Cash received, excluding amounts recognized as revenue  — (19)(19)
Net contract liability at June 30, 2020 (33)(33)
Significant changes in the contract assets and the contract liabilities balances during the six months ended June 30, 2021 are as follows:
(In $ millions)  Contract AssetsContract LiabilitiesNet Contract
Balances
Net contract liability at January 1, 2021   (31)(31)
Amortization of revenue that was included in the beginning contract liability balance  — 10 10 
Cash received, excluding amounts recognized as revenue— (10)(10)
Net contract liability at June 30, 2021   (31)(31)