Basis of Presentation (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Summary of Reclassification From Prior Period [Line Items]
Reclassification adjustment, amount transferred from operating activities to issuance of shares for employee benefit plans in financing activities		$ 220
Reclassification adjustment, amount transferred from account payable and accrued liabilities in operating activities to financing activities		103
Reclassification Adjustment, amount transferred from other assets and liabilities in operating activities to financing activities		117
Noncontrolling interests and other financing activities	$ 71	26
Dividends paid to noncontrolling interests		21
Restructuring reserve		25
Scenario, Previously Reported [Member]
Summary of Reclassification From Prior Period [Line Items]
Noncontrolling interests and other financing activities		$ 5