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Fair Value Measurements, Other Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Cash and temporary cash investments, at carrying amount | $ 4,463 | $ 4,816 | $ 3,778 | $ 4,114
Financial liabilities: |  |  |  |
Debt (excluding capital leases), at carrying amount | 7,926 | 7,926 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash and temporary cash investments, at fair value | 4,463 | 4,816 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Financial liabilities: |  |  |  |
Debt (excluding capital leases), at fair value | $ 8,935 | $ 8,882 |  |

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