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Asset Acquisitions, Dispositions and Other - Settlement, Tax Refund and Debt Issuance (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Feb. 29, 2016 | Jan. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt |  |  |  |  |  |  |  | $ 2,718 | $ 1,478
Republic of Ecuador |  |  |  |  |  |  |  |  |
Litigation Settlement |  |  |  |  |  |  |  |  |
Proceeds from settlement |  |  |  |  |  | $ 330 |  |  |
Pre-tax gain on settlement |  |  |  |  |  |  | $ 681 |  |
Award amount |  |  |  |  | $ 1,000 |  |  |  |
Senior unsecured notes |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  | $ 2,750 |  |  |  |  |  |
Net proceeds from issuance of long-term debt |  |  | $ 2,720 |  |  |  |  |  |
2.60% senior unsecured notes due 2022 |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.60% |  |  |  |  |  |
Debt instrument issued |  |  | $ 400 |  |  |  |  |  |
3.40% senior unsecured notes due 2026 |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.40% |  |  |  |  |  |
Debt instrument issued |  |  | $ 1,150 |  |  |  |  |  |
4.40% senior unsecured notes due 2046 |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.40% |  |  |  |  |  |
Debt instrument issued |  |  | $ 1,200 |  |  |  |  |  |
2.50% senior unsecured notes |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 2.50% |  |  |  |  |
Retired debt |  |  |  | $ 700 |  |  |  |  |
4.125% senior unsecured notes due 2016 |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 4.125% |  |  |  |  | 4.125% |  |  |
Retired debt | $ 750 |  |  |  |  |  |  |  |
1.75% senior unsecured notes due 2017 |  |  |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |  |  |
Early repayment of debt through exercise of redemption option |  | $ 1,250 |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 1.75% |  |  |  |  |  |  |

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