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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Operating activities:        
Net income $ 299 $ 46 $ 643 $ 47
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation and amortization 252 192 433 377
Amortization of debt discount and issuance costs 1 7 17 15
Amortization of costs capitalized to obtain revenue contracts, net 183 148 371 289
Expenses related to employee stock plans 351 256 603 508
(Gains) losses on strategic investments, net (143) 8 (354) 5
Changes in assets and liabilities, net of business combinations:        
Accounts receivable, net (149) (130) 2,013 1,629
Costs capitalized to obtain revenue contracts, net (146) (185) (264) (318)
Prepaid expenses and other current assets and other assets 4 6 (86) (179)
Accounts payable, accrued expenses and other liabilities 179 203 (277) (94)
Unearned revenue (373) (220) (1,175) (718)
Net cash provided by operating activities 458 331 1,924 1,561
Investing activities:        
Business combinations, net of cash acquired (4,803) 0 (4,985) (20)
Purchases of strategic investments (37) (46) (184) (58)
Sales of strategic investments 2 3 6 15
Purchases of marketable securities (28) (501) (291) (1,200)
Sales of marketable securities 335 139 1,273 243
Maturities of marketable securities 40 9 88 13
Capital expenditures (170) (128) (292) (285)
Net cash used in investing activities (4,661) (524) (4,385) (1,292)
Financing activities:        
Proceeds from issuance of debt, net 496 0 2,966 0
Proceeds from employee stock plans 182 183 383 343
Principal payments on capital lease obligations (89) (66) (108) (75)
Repayments of debt 0 0 (1,027) (200)
Net cash provided by financing activities 589 117 2,214 68
Effect of exchange rate changes 11 0 23 5
Net increase (decrease) in cash and cash equivalents (3,603) (76) (224) 342
Cash and cash equivalents, beginning of period 5,922 2,025 2,543 1,607
Cash and cash equivalents, end of period 2,319 1,949 2,319 1,949
Cash paid during the period for:        
Interest 22 21 29 27
Income taxes, net of tax refunds 18 9 37 27
Non-cash investing and financing activities:        
Fair value of equity awards assumed 387 0 387 0
Fair value of common stock issued as consideration for business combinations $ 1,178 $ 0 $ 1,178 $ 6