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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Cash flows from operating activities |  |
Net loss | $ (391) | $ (171)
Adjustments to reconcile to net cash provided by operating activities: |  |
Contract intangible asset amortization | 48 | 45
Depreciation and amortization | 206 | 217
Share-based compensation expense | 8 | 9
Loss on impairment | 168 |
(Gain) loss on disposal of assets, net | 1 | (7)
Loss on retirement of debt | 57 | 18
Deferred income tax expense (benefit) | 10 | (19)
Other, net | 18 | 11
Changes in deferred revenues, net | 5 | 1
Changes in deferred costs, net | (11) | (1)
Changes in other operating assets and liabilities, net | (167) | (154)
Net cash used in operating activities | (48) | (51)
Cash flows from investing activities |  |
Capital expenditures | (107) | (52)
Proceeds from disposal of assets, net | 1 | 12
Investments in unconsolidated affiliates | (6) | (60)
Proceeds from maturities of unrestricted and restricted investments |  | 123
Net cash provided by (used in) investing activities | (112) | 23
Cash flows from financing activities |  |
Proceeds from issuance of debt, net of discounts and issue costs | 743 | 540
Repayments of debt | (909) | (616)
Other, net | (9) | (15)
Net cash used in financing activities | (175) | (91)
Net decrease in unrestricted and restricted cash and cash equivalents | (335) | (119)
Unrestricted and restricted cash and cash equivalents, beginning of period | 2,349 | 2,589
Unrestricted and restricted cash and cash equivalents, end of period | $ 2,014 | $ 2,470

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