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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash Flows from Operating Activities |  |
Net loss | $ (605) | $ (1,748)
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 83 | 182
Loss on disposals | (11) | 0
Share in results from associated companies (net of tax) | (2) | 66
Loss on impairment of investments | 0 | 47
Loss on impairment of convertible bond from related party | 0 | 29
Unrealized (gain)/loss related to derivative financial instruments | (5) | 1
Loss on impairment of long-lived assets | 152 | 1,230
Deferred tax benefit | (1) | (2)
Unrealized (gain)/ loss on marketable securities | (5) | 6
Payment-in-kind interest | 12 | 7
Non-cash reorganization items | 178 | 0
Amortization of discount on debt | 54 | 17
Unrealized foreign exchange (gain)/loss | (4) | 22
Change in allowance for credit losses | 60 | 63
Other cash movements in operating activities |  |
Distributions received from associated company | 6 | 2
Payments for long-term maintenance | (26) | (71)
Repayments made under lease arrangements | (31) | 0
Changes in operating assets and liabilities, net of effect of acquisitions and disposals |  |
Trade accounts receivable | 10 | 16
Trade accounts payable | 15 | (16)
Prepaid expenses/accrued revenue | 3 | 1
Deferred revenue | 3 | (1)
Related party receivables | (17) | (88)
Related party payables | 1 | (9)
Other assets | (8) | 5
Other liabilities | 74 | (39)
Other, net | 0 | 2
Net cash used in operating activities | (64) | (278)
Cash Flows from Investing Activities |  |
Additions to drilling units and equipment | (13) | (14)
Contingent consideration received | 0 | 16
Proceeds from disposal of drilling unit | 7 | 0
Purchase of call option for non-controlling interest shares | 0 | (11)
Loans granted to related party | (23) | (8)
Payments received from loans granted to related parties | 10 | 4
Net cash used in investing activities | (19) | (13)
Cash Flows from Financing Activities |  |
Repayments of secured credit facilities | 0 | (24)
Net cash used in financing activities | 0 | (24)
Effect of exchange rate changes on cash | 4 | (22)
Net decrease in cash and cash equivalents, including restricted cash | (79) | (337)
Cash and cash equivalents, including restricted cash, at beginning of the period | 723 | 1,357
Cash and cash equivalents, including restricted cash, at the end of period | 644 | 1,020
Supplementary disclosure of cash flow information |  |
Interest paid, net of capitalized interest | 0 | (167)
Taxes paid | $ (3) | $ (7)

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