Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 6) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total sales	$ 6,634	$ 6,527	$ 6,375	$ 6,267	$ 6,397	$ 6,155	$ 6,000	$ 5,956	$ 25,803	$ 24,508	$ 23,526
Operating income	767	845	855	832	831	826	797	739	3,299	3,193	3,076
Net earnings	$ 178	$ 645	$ 552	$ 640	$ 525	$ 602	$ 517	$ 556	$ 2,015	$ 2,200	$ 1,990
Basic earnings per share	$ 1.02	$ 3.70	$ 3.16	$ 3.66	$ 2.98	$ 3.38	$ 2.87	$ 3.07	$ 11.55	$ 12.30	$ 10.51
Diluted earnings per share	$ 1.01	$ 3.68	$ 3.15	$ 3.63	$ 2.96	$ 3.35	$ 2.85	$ 3.03	$ 11.47	$ 12.19	$ 10.39
Accounting Standards Update 2014-09 [Member] | Pro Forma [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total sales									$ 26,004	$ 24,706
Operating income									3,246	3,125
Net earnings									$ 1,995	$ 2,156
Basic earnings per share									$ 11.44	$ 12.05
Diluted earnings per share									$ 11.36	$ 11.94