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Debt - Fair Value, Activity, Letters of Credit, Borrowings and Repayments (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Debt |  |  |  |
Short-term debt |  | $ 1,114 |  | $ 1,715
Repayments of senior notes |  | 400 |  |
Letters of credit |  |  |  |
Debt |  |  |  |
Outstanding letters of credit |  | 105 |  | 73
Senior notes |  |  |  |
Debt |  |  |  |
Debt instrument face value |  | 9,900 |  | $ 10,300
Senior notes | 6.13% senior notes due January 2016 |  |  |  |
Debt |  |  |  |
Repayments of senior notes | $ 400 |  |  |
Debt instrument, interest rate | 6.13% |  |  | 6.13%
Senior notes | 6.50% senior notes due May 2018 |  |  |  |
Debt |  |  |  |
Debt instrument face value |  | $ 600 |  |
Debt instrument, interest rate |  | 6.50% |  |
Senior notes | Level 2 |  |  |  |
Debt |  |  |  |
Debt instrument fair value |  | $ 10,100 |  | $ 10,400
Credit facilities and commercial paper program |  |  |  |
Debt |  |  |  |
Total borrowings |  | 36,800 | $ 23,000 |
Total repayments |  | 37,200 | $ 23,600 |
Exchange Traded |  |  |  |
Debt |  |  |  |
Short-term debt |  | $ 12 |  | $ 410

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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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=77997519&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=77997519&loc=d3e13476-108611 + Details
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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 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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