Basis of Presentation (Reclassification) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of Reclassification From Prior Period [Line Items]
Investments	$ 135,000,000	$ 143,000,000
Prepaid pension	1,033,000,000	933,000,000
Reclassification adjustment, amount transfered from operating activities to issuance of shares for employee benefit plans in financing activities	227,000,000	170,000,000	$ 120,000,000
Reclassification adjustment, amount transfered from account payable and accrued liabilities in operating activities to financing activities		85,000,000	62,000,000
Reclassification Adjustment, amount transfered from other assets and liabilities in operating activities to financing activities		85,000,000	58,000,000
Purchases of shares from noncontrolling interests	(39,000,000)	4,000,000	(27,000,000)
Other Noncurrent Assets [Member]
Summary of Reclassification From Prior Period [Line Items]
Investments	$ 135,000,000
Reclassification adjustment		(933,000,000)
Scenario, Previously Reported [Member]
Summary of Reclassification From Prior Period [Line Items]
Investments		143,000,000
Purchases of shares from noncontrolling interests		3,000,000	(8,000,000)
Dividends paid to noncontrolling interests		(24,000,000)	(19,000,000)
Proceeds from sale-leaseback		$ 25,000,000	$ 0