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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