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Debt - Letters of Credit, Borrowings and Repayments (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt |  |  |  |
Outstanding letters of credit |  | $ 95 |  | $ 73
Repayments of senior notes |  | 400 | $ 175 |
Credit facilities and commercial paper program |  |  |  |
Debt |  |  |  |
Total borrowings |  | 52,600 | 41,400 |
Total repayments |  | $ 52,700 | $ 41,600 |
Senior notes | 6.13% senior notes due January 2016 |  |  |  |
Debt |  |  |  |
Repayments of senior notes | $ 400 |  |  |
Debt instrument, interest rate |  |  |  | 6.13%

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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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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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