Summary of Significant Accounting Policies - Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||
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Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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| Error Corrections and Prior Period Adjustments Restatement [Line Items] | |||||
| Net cash provided by operating activities | $ 27,730 | $ 30,135 | $ 92,817 | ||
| Net cash provided by (used in) investing activities | $ (54,954) | (7,600) | $ 25,058 | ||
| Non-Cash Security Proceeds Reclassification | Restatement Adjustment | |||||
| Error Corrections and Prior Period Adjustments Restatement [Line Items] | |||||
| Net cash provided by operating activities | $ 9,300 | $ 4,800 | 3,400 | ||
| Net cash provided by (used in) investing activities | $ 9,300 | $ 4,800 | $ 3,400 | ||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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