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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net income $ 15 $ 49 $ 247
Add (deduct) adjustments to reconcile net income to net cash flows from operating activities      
Depreciation, amortization and accretion 615 618 607
Bad debts expense 89 96 106
Stock-based compensation expense 30 26 25
Deferred income taxes, net (365) 6 55
Equity in earnings of unconsolidated entities (137) (140) (140)
Distributions from unconsolidated entities 136 93 60
Loss on impairment of goodwill 370 0 0
(Gain) loss on asset disposals, net 17 22 16
(Gain) loss on sale of business and other exit costs, net (1)   (114)
(Gain) loss on license sales and exchanges, net (22) (19) (147)
Noncash interest 2 2 2
Other operating activities 0 (2) 0
Changes in assets and liabilities from operations      
Accounts receivable (68) (23) (96)
Equipment installment plans receivable (261) (246) (134)
Inventory   8 118
Accounts payable (14) 48 5
Customer deposits and deferred revenues (3) (54) (37)
Accrued taxes 26 40 34
Accrued interest   (2) 4
Other assets and liabilities 40 (21) (56)
Net cash provided by operating activities 469 501 555
Cash flows from investing activities      
Cash paid for additions to property, plant and equipment (465) (443) (581)
Cash paid for licenses (189) (53) (286)
Cash paid for investments (50) 0 0
Cash received from divestitures and exchanges 21 21 317
Federal Communications Commission deposit 0 (143) 0
Net cash used in investing activities (683) (618) (550)
Cash flows from financing activities      
Issuance of long-term debt 0 0 525
Repayment of long-term debt (14) (11)  
Common shares reissued for benefit plans, net of tax payments 1 6 2
Common shares repurchased 0 (5) (6)
Payment of debt issuance costs (2) (2) (13)
Acquisition of assets in common control transaction 0 0 (2)
Distributions to noncontrolling interests (4) (1) (6)
Payments to acquire additional interest in subsidiaries 0 0 (2)
Other financing activities (1) 1 (1)
Net cash provided by (used in) financing activities (20) (12) 497
Net increase (decrease) in cash, cash equivalents and restricted cash (234) (129) 502
Cash, cash equivalents and restricted cash      
Beginning of period 586 715 213
End of period $ 352 $ 586 $ 715