Accumulated Other Comprehensive Losses (Components of Accumulated Other Comprehensive Losses, Net Of Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Currency translation adjustments	$ (6,129)	$ (3,929)	$ (2,207)
Pension and other benefits	(3,332)	(3,020)	(2,046)
Derivatives accounted for as hedges	59	123	63
Total accumulated other comprehensive losses	(9,402)	(6,826)	(4,190)
Marketing, administration and research costs	6,656	7,001	6,890
Accumulated Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Marketing, administration and research costs	$ 1	$ 5	$ 12