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Debt - Fair Value, Activity, Letters of Credit, Borrowings and Repayments (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Debt |  |  |  |
Repayments of senior notes |  | $ 175 | $ 549 |
Letters of credit |  |  |  |
Debt |  |  |  |
Outstanding letters of credit |  | 47 |  | $ 46
Senior notes |  |  |  |
Debt |  |  |  |
Debt instrument face value |  | 9,600 |  | 9,800
Senior notes | 5.88% senior notes due August 2016 |  |  |  |
Debt |  |  |  |
Repayments of senior notes | $ 175 |  |  |
Debt instrument, interest rate | 5.88% |  |  |
Senior notes | Level 2 |  |  |  |
Debt |  |  |  |
Debt instrument fair value |  | 9,700 |  | $ 8,600
Credit facilities and commercial paper program |  |  |  |
Debt |  |  |  |
Total borrowings |  | 41,400 | 37,100 |
Total repayments |  | $ 41,600 | $ 36,900 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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