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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities    
Net income (loss) $ (1,584) $ 334
Adjustments to reconcile to net cash provided by operating activities:    
Depreciation 451 442
Share-based compensation expense 21 23
Loss on impairment 113 15
Loss on disposal of assets, net 1,593 1
(Gain) loss on retirement of debt 48 (38)
Deferred tax expense (benefit) (39) 39
Other, net 18 7
Changes in deferred revenues, net (104) (26)
Changes in deferred costs, net 28 52
Changes in other operating assets and liabilities, net (42) (11)
Net cash provided by operating activities 503 838
Cash flows from investing activities    
Capital expenditures (258) (826)
Proceeds from disposal of assets, net 329 15
Other, net (15)  
Net cash provided by (used in) investing activities 56 (811)
Cash flows from financing activities    
Proceeds from issuance of debt, net of issue costs 403  
Repayments of debt (1,533) (251)
Deposits to cash accounts restricted for financing activities (57) (24)
Proceeds from cash accounts and investments restricted for financing activities 50 73
Distribution to holders of noncontrolling interest   (16)
Other, net (3) 5
Net cash used in financing activities (1,140) (213)
Net decrease in cash and cash equivalents (581) (186)
Cash and cash equivalents at beginning of period 3,052 2,339
Cash and cash equivalents at end of period $ 2,471 $ 2,153