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Debt - Fair Value, Activity, Letters of Credit (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Credit facilities and commercial paper program |  |  |
Debt |  |  |
Total borrowings | $ 23,000 | $ 17,900 |
Total repayments | 23,600 | $ 17,700 |
Letters of credit |  |  |
Debt |  |  |
Outstanding letters of credit | 48 |  | $ 46
Senior notes |  |  |
Debt |  |  |
Debt instrument face value | 9,800 |  | 9,800
Senior notes | Level 2 |  |  |
Debt |  |  |
Debt instrument fair value | $ 9,600 |  | $ 8,600

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + Details
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