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Fair Value Measurements, Other Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Cash and temporary cash investments, at carrying amount | $ 4,114 | $ 3,689 | $ 4,292 | $ 1,723
Financial liabilities: |  |  |  |
Debt (excluding capital leases), at carrying amount | 7,292 | 6,354 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash and temporary cash investments, at fair value | 4,114 | 3,689 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Financial liabilities: |  |  |  |
Debt (excluding capital leases), at fair value | $ 7,759 | $ 7,562 |  |

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