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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Cash Flows from Operating Activities |  |  |  |  |
Net loss |  | $ (605) | $ (3,885) | $ (4,663) | $ (1,222)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |  |  |
Depreciation |  | 236 | 391 | 346 | 426
Amortization of unfavorable and favorable contracts |  | 58 | (21) | 1 | 134
Share of results from associated companies |  | 90 | (149) | 77 | 115
Impairment of investments |  | 0 | 0 | 47 | 302
Contingent consideration realized |  | 0 | (7) | 0 | 0
Gain on disposals |  | 0 | 0 | (15) | 0
Unrealized loss related to derivatives |  | 31 | 4 | 0 | 37
Fair value measurement on deconsolidation of VIE | [1] | 0 | 0 | (509) | 0
Payment in kind interest |  | 15 | (15) | 14 | 6
Loss on impairment of long-lived assets |  | 0 | 414 | 4,087 | 0
Loss on impairment of intangibles |  | 0 | 0 | 21 | 0
Deferred tax benefit |  | (22) | 0 | (7) | (61)
Unrealized foreign exchange loss |  |  |  | 19 | 0
Amortization of discount on debt |  | 23 | 0 | 122 | 36
Change in allowance for credit losses |  | 0 | 0 | 166 | 0
Impairment of convertible bond from related party | [1] | 0 | 0 | 29 | 11
Net loss on debt extinguishment |  | 0 | 0 | 0 | 22
Unrealized loss on marketable securities |  | 64 | 3 | 3 | 46
Non-cash gain on liabilities subject to compromise |  | 0 | (2,977) | 0 | 0
Fresh start valuation adjustments |  | 0 | 6,142 | 0 | 0
Other re-organization items |  | 0 | 6 | 0 | 0
Other |  | (3) | 2 | 8 | 3
Other cash movements in operating activities |  |  |  |  |
Distributions received from associated companies |  | 32 | 17 | 2 | 11
Payments for long-term maintenance |  | (71) | (78) | (121) | (114)
Settlement of payment-in-kind interest on Senior Secured Notes |  | 0 | 0 | 0 | (39)
Changes in operating assets and liabilities, net of effect of acquisitions and disposals |  |  |  |  |
Trade accounts receivable |  | 64 | 29 | 48 | 35
Trade accounts payable |  | (31) | 4 | (38) | 4
Prepaid expenses/accrued revenue |  | 12 | 42 | (52) | (1)
Deferred revenue |  | 21 | (23) | (5) | 13
Related party receivables |  | 22 | 2 | (105) | (14)
Related party payables |  | 54 | (42) | (5) | (4)
Other assets |  | (20) | (62) | 30 | (12)
Other liabilities |  | 4 | (10) | 80 | 10
Net cash used in operating activities |  | (26) | (213) | (420) | (256)
Cash Flows from Investing Activities |  |  |  |  |
Additions to newbuildings |  | 0 | (1) | 0 | 0
Additions to drilling units and equipment |  | (27) | (48) | (27) | (48)
Purchase of call option for non-controlling interest shares |  | 0 | 0 | (11) | 0
Contingent consideration received |  | 65 | 48 | 32 | 32
Loans granted to related party |  | 0 | 0 | (8) | 0
Sale of rigs and equipment |  | 0 | 126 | 0 | 0
Impact to cash resulting from deconsolidation of VIE |  | 0 | 0 | (22) | 0
Investment in associated companies |  | 0 | 0 | 0 | (25)
Payments received from loans granted to related parties |  | 23 | 24 | 4 | 15
Net cash (used in)/provided by investing activities |  | 61 | 149 | (32) | (26)
Cash Flows from Financing Activities |  |  |  |  |
Proceeds from debt |  | 0 | 875 | 0 | 0
Repayments of secured credit facilities |  | (83) | (153) | (132) | (34)
Redemption of Senior Secured Notes |  | (121) | 0 | 0 | (333)
Debt fees paid |  | (4) | (35) | 0 | 0
Purchase of redeemable AOD non-controlling interest |  | 0 | 0 | (31) | 0
Proceeds from issuance of shares |  | 0 | 200 | 0 | 0
Net cash (used in)/provided by financing activities |  | (208) | 887 | (163) | (367)
Effect of exchange rate changes on cash and cash equivalents |  | (1) | (5) | (19) | 3
Net (decrease)/increase in cash and cash equivalents, including restricted cash |  | (174) | 818 | (634) | (646)
Cash and cash equivalents, including restricted cash, at beginning of the year |  | 2,177 | 1,359 | 1,357 | 2,003
Cash and cash equivalents, including restricted cash, at the end of year |  | 2,003 | 2,177 | 723 | 1,357
Supplementary disclosure of cash flow information |  |  |  |  |
Interest paid, net of capitalized interest |  | (178) | (38) | (181) | (391)
Taxes paid |  | $ (16) | $ (22) | $ (13) | $ (36)
[1] | Includes transactions with related parties. Refer to Note 32 - "Related party transactions" for further details.

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration