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Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017
Cash and cash equivalents and restricted cash |  |  |  |
Cash and cash equivalents |  |  | $ 42,023 | $ 1,696
Total cash, cash equivalents and restricted cash in the statement of cash flows | $ 1,900 | $ 3,520 | 42,264 | 1,900
Condensed Consolidated Statements of Cash Flows |  |  |  |
Acquisitions (net of cash acquired) and other investments | (368) | (93) |  |
Net cash used in investing activities | (131) | (537) |  |
Net decrease in cash, cash equivalents and restricted cash | 40,364 | (1,137) |  |
Cash, cash equivalents and restricted cash at the beginning of the period | 1,900 | 3,520 |  |
Cash, cash equivalents and restricted cash at the end of the period | 42,264 | 2,383 |  |
Adjustments Early Adoption | ASU 2018-02 | Adjustments |  |  |  |
Condensed Consolidated Statements of Income |  |  |  |
Amounts reclassified from accumulated other comprehensive income | (7) |  |  |
ASU 2016-18 |  |  |  |
Cash and cash equivalents and restricted cash |  |  |  |
Cash and cash equivalents |  |  | 42,023 | 1,696
Total cash, cash equivalents and restricted cash in the statement of cash flows | 1,900 |  | 42,264 | 1,900
Condensed Consolidated Statements of Cash Flows |  |  |  |
Cash, cash equivalents and restricted cash at the beginning of the period | 1,900 |  |  |
Cash, cash equivalents and restricted cash at the end of the period | $ 42,264 |  |  |
ASU 2016-18 | Previously Reported |  |  |  |
Cash and cash equivalents and restricted cash |  |  |  |
Total cash, cash equivalents and restricted cash in the statement of cash flows |  | 3,371 |  |
Condensed Consolidated Statements of Cash Flows |  |  |  |
Acquisitions (net of cash acquired) and other investments |  | (110) |  |
Net cash used in investing activities |  | (554) |  |
Net decrease in cash, cash equivalents and restricted cash |  | (1,154) |  |
Cash, cash equivalents and restricted cash at the beginning of the period |  | 3,371 |  |
Cash, cash equivalents and restricted cash at the end of the period |  | 2,217 |  |
ASU 2016-18 | Adjustments |  |  |  |
Cash and cash equivalents and restricted cash |  |  |  |
Total cash, cash equivalents and restricted cash in the statement of cash flows |  | 149 |  |
Condensed Consolidated Statements of Cash Flows |  |  |  |
Acquisitions (net of cash acquired) and other investments |  | 17 |  |
Net cash used in investing activities |  | 17 |  |
Net decrease in cash, cash equivalents and restricted cash |  | 17 |  |
Cash, cash equivalents and restricted cash at the beginning of the period |  | 149 |  |
Cash, cash equivalents and restricted cash at the end of the period |  | $ 166 |  |
ASU 2016-18 | Other Current Assets |  |  |  |
Cash and cash equivalents and restricted cash |  |  |  |
Restricted Cash and Cash Equivalents |  |  | 14 | 14
ASU 2016-18 | Other Long-Term Assets |  |  |  |
Cash and cash equivalents and restricted cash |  |  |  |
Restricted Cash and Cash Equivalents |  |  | $ 227 | $ 190

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