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Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Cash and cash equivalents and restricted cash |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 43,815 | $ 1,696
Total cash, cash equivalents and restricted cash in the statement of cash flows | $ 1,900 | $ 1,900 | $ 3,520 | 44,057 | 1,900
Condensed Consolidated Statements of Cash Flows |  |  |  |  |
Acquisitions (net of cash acquired) and other investments |  | (573) | (275) |  |
Net cash used in investing activities |  | (752) | (1,134) |  |
Net decrease in cash, cash equivalents and restricted cash |  | 42,157 | (1,237) |  |
Cash, cash equivalents and restricted cash at the beginning of the period | 1,900 | 1,900 | 3,520 |  |
Cash, cash equivalents and restricted cash at the end of the period |  | 44,057 | 2,283 |  |
Adjustments Early Adoption | ASU 2018-02 | Adjustments |  |  |  |  |
Condensed Consolidated Statements of Operations |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (7) |  |  |  |
ASU 2016-18 |  |  |  |  |
Cash and cash equivalents and restricted cash |  |  |  |  |
Cash and cash equivalents |  |  |  | 43,815 | 1,696
Total cash, cash equivalents and restricted cash in the statement of cash flows | 1,900 | 1,900 |  | 44,057 | 1,900
Condensed Consolidated Statements of Cash Flows |  |  |  |  |
Cash, cash equivalents and restricted cash at the beginning of the period | $ 1,900 | 1,900 |  |  |
Cash, cash equivalents and restricted cash at the end of the period |  | $ 44,057 |  |  |
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 |  |  | (315) |  |
Net cash used in investing activities |  |  | (1,174) |  |
Net decrease in cash, cash equivalents and restricted cash |  |  | (1,277) |  |
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 |  |  | 2,094 |  |
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 |  |  | 40 |  |
Net cash used in investing activities |  |  | 40 |  |
Net decrease in cash, cash equivalents and restricted cash |  |  | 40 |  |
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 |  |  | $ 189 |  |
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 |  |  |  | $ 228 | $ 190

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