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v3.19.1

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Operating Activities: |  |
Net income | $ 1,968 | $ 1,539
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation expense | 60 | 56
Amortization expense | 299 | 301
Stock-based compensation expense | 143 | 220
Deferred income taxes | 24 | 35
Other | (157) | 49
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 32 | 101
Inventories | (15) | (14)
Prepaid expenses and other | (43) | 529
Accounts payable | (201) | (92)
Income taxes payable | (249) | (618)
Accrued liabilities and other | (417) | 164
Net cash provided by operating activities | 1,444 | 2,270
Investing Activities: |  |
Purchases of marketable debt securities | (6,722) | (397)
Proceeds from sales of marketable debt securities | 575 | 221
Proceeds from maturities of marketable debt securities | 6,511 | 4,762
Capital expenditures | (237) | (212)
Other | 238 | 20
Net cash provided by (used in) investing activities | (111) | 4,354
Financing Activities: |  |
Proceeds from issuances of common stock | 103 | 111
Repurchases of common stock | (834) | (1,039)
Repayments of debt and other obligations | (750) | (4,500)
Payments of dividends | (817) | (753)
Other | (68) | (414)
Net cash used in financing activities | (2,366) | (6,595)
Effect of exchange rate changes on cash and cash equivalents | 20 | 26
Net change in cash and cash equivalents | (1,013) | 55
Cash and cash equivalents at beginning of period | 17,940 | 7,588
Cash and cash equivalents at end of period | $ 16,927 | $ 7,643

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration