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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair Value Measurements, Other Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Financial assets:
Cash and temporary cash investments, at carrying amount	$ 5,949	$ 4,114	$ 5,301	$ 3,689
Financial liabilities:
Debt (excluding capital leases), at carrying amount	8,875	7,292
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and temporary cash investments, at fair value	5,949	4,114
Fair Value, Inputs, Level 2 [Member]
Financial liabilities:
Debt (excluding capital leases), at fair value	$ 10,005	$ 7,759