Accumulated Other Comprehensive Losses (Components of Accumulated Other Comprehensive Losses, Net Of Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	$ (10,900)	$ (11,476)	$ (11,203)	$ (6,274)
Marketing, administration and research costs	6,405	6,656	7,001
Currency translation adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	(6,091)	(6,129)	(3,929)
Currency translation adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Marketing, administration and research costs	(5)	1	5
Pension and other benefits [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	(3,565)	(3,332)	(3,020)
Derivatives accounted for as hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	97	59	123
Accumulated Other Comprehensive Losses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total accumulated other comprehensive losses	$ (9,559)	$ (9,402)	$ (6,826)	$ (4,190)