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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities |  |  |
Net loss | $ (1,257) | $ (2,003) | $ (3,097)
Adjustments to reconcile to net cash provided by operating activities: |  |  |
Contract intangible asset amortization | 187 | 112 |
Depreciation and amortization | 855 | 818 | 832
Share-based compensation expense | 37 | 45 | 41
Loss on impairment | 609 | 1,464 | 1,498
Loss on disposal of assets, net | 12 |  | 1,603
Loss on retirement of debt | 41 | 3 | 55
Gain on termination of construction contracts | (132) |  |
Deferred income tax expense | 248 | (16) | 89
Other, net | 41 | 6 | 55
Changes in deferred revenues, net | 43 | (139) | 33
Deferred income tax expense (benefit) | (33) | 34 | 54
Changes in other operating assets and liabilities, net | (311) | 234 | 7
Net cash provided by operating activities | 340 | 558 | 1,170
Cash flows from investing activities |  |  |
Capital expenditures | (387) | (184) | (497)
Proceeds from disposal of assets, net | 70 | 43 | 350
Investments in unconsolidated affiliates | (77) | (107) |
Cash paid in business combinations, net of cash acquired |  | (883) |
Proceeds from maturities of unrestricted and restricted investments | 123 | 507 |
Deposits to unrestricted investments |  | (173) | (450)
Other, net | 3 |  | 10
Net cash used in investing activities | (268) | (797) | (587)
Cash flows from financing activities |  |  |
Proceeds from issuance of debt, net of discounts and issue costs | 1,056 | 2,054 | 1,144
Repayments of debt | (1,325) | (2,105) | (2,284)
Proceeds from investments restricted for financing activities |  | 26 | 102
Payments to terminate derivative instruments |  | (92) |
Other, net | (43) | (30) | (3)
Net cash used in financing activities | (312) | (147) | (1,041)
Net decrease in unrestricted and restricted cash and cash equivalents | (240) | (386) | (458)
Unrestricted and restricted cash and cash equivalents, beginning of period | 2,589 | 2,975 | 3,433
Unrestricted and restricted cash and cash equivalents, end of period | $ 2,349 | $ 2,589 | $ 2,975

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