Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 1,360	$ 528	$ 2,525	$ 2,151
Weighted-average shares outstanding	468,021,093	324,210,936	460,631,794	325,904,502
Share-based compensation plans	3,375,269	2,962,484	3,439,017	3,269,724
Weighted-average shares outstanding and assumed conversions	471,396,362	327,173,420	464,070,811	329,174,226
Basic earnings per share (US$ per share)	$ 2.90	$ 1.63	$ 5.48	$ 6.60
Diluted earnings per share (US$ per share)	$ 2.88	$ 1.62	$ 5.44	$ 6.53
Potential anti-dilutive share conversions	1,306,710	1,907,815	1,635,337	1,503,830