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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities |  |  |
Net loss | $ (409) | $ (1,760) | $ (2,995)
Adjustments to reconcile to net cash provided by operating activities: |  |  |
Contract intangible asset amortization | 29 | 78 |
Depreciation | 201 | 614 | 648
Share-based compensation expense |  | 36 | 30
Loss on impairment | 432 | 1,446 | 1,498
Loss on disposal of assets, net |  |  | 1,602
Loss on retirement of debt | 1 | 3 | 49
Deferred income tax expense (benefit) |  | 50 | 32
Other, net |  | 12 | 29
Changes in deferred revenues, net |  | (127) | (109)
Changes in deferred costs, net |  | 23 | 42
Changes in other operating assets and liabilities, net |  | (55) | 100
Net cash provided by operating activities |  | 320 | 926
Cash flows from investing activities |  |  |
Capital expenditures |  | (140) | (386)
Proceeds from disposal of assets, net |  | 37 | 330
Unrestricted and restricted cash acquired in business combination |  | 131 |
Investment in unconsolidated affiliates |  | (107) |
Deposits into short-term investments |  | (50) |
Proceeds from maturities of short-term investments |  | 500 |
Other, net |  |  | 10
Net cash provided by (used in) investing activities |  | 371 | (46)
Cash flows from financing activities |  |  |
Proceeds from issuance of debt, net of discounts and issue costs |  | 1,319 | 403
Repayments of debt |  | (2,015) | (1,629)
Proceeds from investments restricted for financing activities |  | 26 | 102
Payments to terminate derivative instruments |  | (92) |
Other, net |  | (29) | (3)
Net cash used in financing activities |  | (791) | (1,127)
Net decrease in unrestricted and restricted cash and cash equivalents |  | (100) | (247)
Unrestricted and restricted cash and cash equivalents at beginning of period |  | 2,975 | 3,433
Unrestricted and restricted cash and cash equivalents at end of period | $ 2,875 | $ 2,875 | $ 3,186

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