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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |  |
Net income |  | $ 131,000,000 | $ 914,000,000 | $ 1,176,000,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation and amortization |  | 506,000,000 | 468,000,000 | 301,000,000
Impairment charges |  | 976,000,000 | 0 | 0
Non-cash interest expense, net of amortization of premium |  | 20,000,000 | 17,000,000 | 9,000,000
Provision for doubtful accounts |  | 60,000,000 | 53,000,000 | 51,000,000
Amortization of deferred income related to equity method investment |  | (3,000,000) | (3,000,000) | (3,000,000)
Loss on extinguishment of debt |  | 40,000,000 | 57,000,000 | 0
Loss on unconsolidated entity investments, net |  | 16,000,000 | 21,000,000 | 10,000,000
Gain on fair value instrument |  | 0 | 0 | (43,000,000)
Dividend received from unconsolidated entity investment |  | 2,000,000 | 2,000,000 | 2,000,000
Loss on restructuring |  | 24,000,000 | 0 | 0
(Gain) loss on other investments |  | (3,000,000) | (3,000,000) | 1,000,000
Share-based payment expense |  | 223,000,000 | 250,000,000 | 133,000,000
Deferred income taxes |  | 238,000,000 | 259,000,000 | 257,000,000
Amortization of right-of-use assets |  | 56,000,000 | 56,000,000 | 0
Changes in operating assets and liabilities: |  |  |  |
Receivables |  | (36,000,000) | (137,000,000) | (42,000,000)
Inventory |  | (2,000,000) | 11,000,000 | (2,000,000)
Related party, net |  | 0 | (10,000,000) | 1,000,000
Prepaid expenses and other current assets |  | 14,000,000 | 10,000,000 | (20,000,000)
Other long-term assets |  | (61,000,000) | 7,000,000 | 9,000,000
Accounts payable and accrued expenses |  | 42,000,000 | 109,000,000 | (20,000,000)
Accrued interest |  | 13,000,000 | 32,000,000 | (9,000,000)
Deferred revenue |  | (223,000,000) | (58,000,000) | 70,000,000
Operating lease liabilities |  | (53,000,000) | (47,000,000) | 0
Other long-term liabilities |  | 38,000,000 | 9,000,000 | (1,000,000)
Net cash provided by operating activities |  | 2,018,000,000 | 2,017,000,000 | 1,880,000,000
Cash flows from investing activities: |  |  |  |
Additions to property and equipment |  | (350,000,000) | (363,000,000) | (355,000,000)
Purchases of other investments |  | (8,000,000) | (7,000,000) | (8,000,000)
Acquisition of business, net of cash acquired |  | (300,000,000) | 313,000,000 | (2,000,000)
Sale of short-term investments |  | 0 | 73,000,000 | 0
Investments in related parties and other equity investees |  | (94,000,000) | (19,000,000) | (17,000,000)
Repayment from related party |  | 11,000,000 | 0 | 3,000,000
Net cash used in investing activities |  | (741,000,000) | (3,000,000) | (379,000,000)
Cash flows from financing activities: |  |  |  |
Proceeds from exercise of stock options |  | 0 | 8,000,000 | 0
Taxes paid from net share settlements for stock-based compensation |  | (114,000,000) | (150,000,000) | (120,000,000)
Revolving credit facility, net of deferred financing costs |  | 649,000,000 | (439,000,000) | 136,000,000
Proceeds from long-term borrowings, net of costs |  | 1,481,000,000 | 2,715,000,000 | 0
Proceeds from sale of capped call security |  | 0 | 3,000,000 | 0
Principal payments of long-term borrowings |  | (1,507,000,000) | (1,666,000,000) | (16,000,000)
Payment of premiums on redemption of debt |  | (31,000,000) | (45,000,000) | 0
Common stock repurchased and retired |  | (1,555,000,000) | (2,159,000,000) | (1,314,000,000)
Dividends paid |  | (237,000,000) | (226,000,000) | (201,000,000)
Net cash used in financing activities |  | (1,314,000,000) | (1,959,000,000) | (1,515,000,000)
Net (decrease) increase in cash, cash equivalents and restricted cash |  | (37,000,000) | 55,000,000 | (14,000,000)
Cash, cash equivalents and restricted cash at beginning of period | [1] | 120,000,000 | 65,000,000 | 79,000,000
Cash, cash equivalents and restricted cash at end of period | [1] | 83,000,000 | 120,000,000 | 65,000,000
Cash paid during the period for: |  |  |  |
Interest, net of amounts capitalized |  | 358,000,000 | 337,000,000 | 345,000,000
Income taxes paid |  | 38,000,000 | 10,000,000 | 6,000,000
Non-cash investing and financing activities: |  |  |  |
Treasury stock not yet settled |  | (19,000,000) | 0 | 17,000,000
Fair value of shares issued related to acquisition of a business |  | 0 | 2,355,000,000 | 0
Accumulated other comprehensive income (loss), net of tax |  | $ 7,000,000 | $ 14,000,000 | $ (29,000,000)
[1] | The following table reconciles cash, cash equivalents and restricted cash per the statement of cash flows to the balance sheet. The restricted cash balances are primarily due to letters of credit which have been issued to the landlords of leased office space. The terms of the letters of credit primarily extend beyond one year.
(in millions) | December 31, 2020 |  | December 31, 2019 |  | December 31, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 71 |  |  | $ | 106 |  |  | $ | 54 |  |  | $ | 69 |
Restricted cash included in Other long-term assets | 12 |  |  | 14 |  |  | 11 |  |  | 10 |
Total cash, cash equivalents and restricted cash at end of period | $ | 83 |  |  | $ | 120 |  |  | $ | 65 |  |  | $ | 79 |

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