Expense Recognized in Connection with Share-Based Awards (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Earnings before income taxes	$ 834	$ 1,105	$ 453	$ 600	$ 667	$ 1,055	$ 889	$ 974	$ 2,992	$ 3,585	$ 2,235
Net earnings									1,964	2,344	1,497
Net earnings per share:
Basic	$ 1.17	$ 1.60	$ 0.60	$ 0.84	$ 0.93	$ 1.47	$ 1.24	$ 1.36	$ 4.21	$ 5.00	$ 3.21
Diluted	$ 1.17	$ 1.59	$ 0.60	$ 0.84	$ 0.92	$ 1.46	$ 1.23	$ 1.35	$ 4.18	$ 4.95	$ 3.19
Share Based Compensation Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Earnings from continuing operations									39	39	38
Earnings before income taxes									39	39	38
Net earnings									$ 27	$ 27	$ 27
Net earnings per share:
Basic									$ 0.06	$ 0.06	$ 0.06
Diluted									$ 0.06	$ 0.06	$ 0.06