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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Cash flows from operating activities:    
Consolidated net income $ 197 $ 348
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on deconsolidation of GRAIL   (453)
Depreciation expense 30 26
Amortization of intangible assets 9 12
Share-based compensation expense 48 50
Accretion of debt discount 8 7
Deferred income taxes (11) 86
Impairment of intangible assets   23
Other (6) (2)
Changes in operating assets and liabilities:    
Accounts receivable 11 16
Inventory (17) 1
Prepaid expenses and other current assets (2) 2
Other assets (1) (1)
Accounts payable 2 (3)
Accrued liabilities (18) 52
Other long-term liabilities 5 4
Net cash provided by operating activities 255 168
Cash flows from investing activities:    
Purchases of available-for-sale securities (598) (61)
Sales of available-for-sale securities 288 40
Maturities of available-for-sale securities 415 48
Proceeds from sale of GRAIL securities   278
Deconsolidation of GRAIL cash   (52)
Net purchases of strategic investments (3) (7)
Purchases of property and equipment (90) (83)
Net cash provided by investing activities 12 163
Cash flows from financing activities:    
Payments on financing obligations (2) (1)
Common stock repurchases   (101)
Taxes paid related to net share settlement of equity awards (13) (22)
Proceeds from issuance of common stock 21 22
Contributions from noncontrolling interest owners 61 16
Net cash provided by (used in) financing activities 67 (86)
Effect of exchange rate changes on cash and cash equivalents 1 1
Net increase in cash and cash equivalents 335 246
Cash and cash equivalents at beginning of period 1,225 735
Cash and cash equivalents at end of period $ 1,560 $ 981