| Income Effect of Derivative Instruments [Table Text Block] |
The gains/(losses), by hedge designation, recorded in income for the periods ended September 30 were as follows (in millions): | | | | | | | | | | | | | | | | | | Third Quarter | | First Nine Months | | 2016 | | 2017 | | 2016 | | 2017 | Cash flow hedges (a) | | | | | | | | Reclassified from AOCI to net income | $ | 202 |
| | $ | 115 |
| | $ | 335 |
| | $ | 357 |
| Fair value hedges | | | | | | | | Interest rate contracts | | | | | | | | Net interest settlements and accruals excluded from the assessment of hedge effectiveness | 95 |
| | 50 |
| | 292 |
| | 182 |
| Ineffectiveness (b) | (1 | ) | | — |
| | 21 |
| | — |
| Derivatives not designated as hedging instruments | | | | | | | | Foreign currency exchange contracts | 29 |
| | (168 | ) | | 61 |
| | (594 | ) | Cross-currency interest rate swap contracts | 128 |
| | 5 |
| | 463 |
| | 79 |
| Interest rate contracts | 21 |
| | 20 |
| | (70 | ) | | 57 |
| Commodity contracts | 3 |
| | 21 |
| | 7 |
| | 53 |
| Total | $ | 477 |
| | $ | 43 |
| | $ | 1,109 |
| | $ | 134 |
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__________ | | (a) | For the third quarter and first nine months of 2016, a $340 million gain and a $887 million gain, respectively, were recorded in Other comprehensive income. For the third quarter and first nine months of 2017, a $116 million loss and a $90 million gain, respectively, were recorded in Other comprehensive income. |
| | (b) | For the third quarter and first nine months of 2016, hedge ineffectiveness reflects the net change in fair value on derivatives of $228 million loss and $655 million gain, respectively, and a change in value on hedged debt attributable to the change in benchmark interest rates of $227 million gain and $634 million loss, respectively. For the third quarter and first nine months of 2017, hedge ineffectiveness reflects the net change in fair value on derivatives of $40 million loss and $95 million loss, respectively, and a change in value on hedged debt attributable to the change in benchmark interest rates of $40 million gain and $95 million gain, respectively. |
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| Balance Sheet Effect of Derivative Instruments [Table Text Block] |
The fair value of our derivative instruments and the associated notional amounts, presented gross, were as follows (in millions): | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2016 | | September 30, 2017 | | Notional | | Fair Value of Assets | | Fair Value of Liabilities | | Notional | | Fair Value of Assets | | Fair Value of Liabilities | Cash flow hedges | | | | | | | | | | | | Foreign currency exchange contracts | $ | 19,091 |
| | $ | 620 |
| | $ | 257 |
| | $ | 18,734 |
| | $ | 466 |
| | $ | 352 |
| Fair value hedges | |
| | |
| | |
| | | | | | | Interest rate contracts | 33,175 |
| | 487 |
| | 80 |
| | 31,802 |
| | 323 |
| | 132 |
| Derivatives not designated as hedging instruments | | | | | | | | | | | Foreign currency exchange contracts | 17,227 |
| | 379 |
| | 194 |
| | 19,792 |
| | 259 |
| | 357 |
| Cross-currency interest rate swap contracts | 3,201 |
| | 242 |
| | 8 |
| | 3,998 |
| | 370 |
| | 22 |
| Interest rate contracts | 61,689 |
| | 156 |
| | 74 |
| | 57,144 |
| | 227 |
| | 119 |
| Commodity contracts | 531 |
| | 11 |
| | 6 |
| | 603 |
| | 25 |
| | 2 |
| Total derivative financial instruments, gross (a) (b) | $ | 134,914 |
| | $ | 1,895 |
| | $ | 619 |
| | $ | 132,073 |
| | $ | 1,670 |
| | $ | 984 |
| | | | | | | | | | | | | Current portion | | | $ | 1,108 |
| | $ | 371 |
| | | | $ | 937 |
| | $ | 612 |
| Non-current portion | | | 787 |
| | 248 |
| | | | 733 |
| | 372 |
| Total derivative financial instruments, gross | | | $ | 1,895 |
| | $ | 619 |
| | | | $ | 1,670 |
| | $ | 984 |
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__________ | | (a) | At December 31, 2016 and September 30, 2017, we held collateral of $15 million and $11 million, and we posted collateral of $12 million and $31 million, respectively. |
| | (b) | At December 31, 2016 and September 30, 2017, the fair value of assets and liabilities available for counterparty netting was $554 million and $669 million, respectively. All derivatives are categorized within Level 2 of the fair value hierarchy. |
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