Quarterly Financial Data (Schedule Of Quarterly Financial Data) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended			3 Months Ended								12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2013	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Quarterly Financial Information [Line Items]
Revenues				$ 24,468	$ 23,784	$ 22,045	$ 20,465	$ 23,785	$ 22,130	$ 21,815	$ 18,893	$ 90,762	$ 86,623	$ 81,698
Total costs and expenses				(20,711)	(20,075)	(18,670)	(17,296)	(20,388)	(18,674)	(18,450)	(15,756)	(76,752)	(73,268)	(68,665)
Earnings from operations				2,025	2,119	1,787	1,542	1,515	1,803	1,716	1,528	7,473	6,562	6,290
Net earnings from continuing operations				1,466	1,362	1,653	965	1,233	1,160	1,087	1,106	5,446	4,586	3,903
Net (loss)/gain from disposal of discontinued operations									(2)	1			(1)	(3)
Net earnings				$ 1,466	$ 1,362	$ 1,653	$ 965	$ 1,233	$ 1,158	$ 1,088	$ 1,106	$ 5,446	$ 4,585	$ 3,900
Basic earnings per share from continuing operations				$ 2.05	$ 1.88	$ 2.26	$ 1.30	$ 1.63	$ 1.53	$ 1.43	$ 1.45	$ 7.47	$ 6.03	$ 5.15
Basic earnings per share				$ 2.05	$ 1.88	$ 2.26	$ 1.30	$ 1.63	$ 1.53	$ 1.43	$ 1.45	$ 7.47	$ 6.03	$ 5.15
Diluted earnings per share from continuing operations				$ 2.02	$ 1.86	$ 2.24	$ 1.28	$ 1.61	$ 1.51	$ 1.41	$ 1.44	$ 7.38	$ 5.96	$ 5.11
Diluted earnings per share				$ 2.02	$ 1.86	$ 2.24	$ 1.28	$ 1.61	$ 1.51	$ 1.41	$ 1.44	$ 7.38	$ 5.96	$ 5.11
Cash dividends declared, per share	$ 0.91	$ 0.73	$ 0.485	$ 1.64		$ 1.46		$ 1.215		$ 0.97		$ 3.100	$ 2.185	$ 1.805
Common stock sales price per share, Quarter end	$ 129.98	$ 136.49		$ 129.98	$ 127.38	$ 127.23	$ 125.49	$ 136.49	$ 117.50	$ 102.44	$ 85.85	$ 129.98	$ 136.49
Maximum [Member]
Schedule of Quarterly Financial Information [Line Items]
Common stock sales price per share				$ 135.78	$ 130.58	$ 138.39	$ 144.57	$ 142.00	$ 120.38	$ 104.15	$ 86.84
Minimum [Member]
Schedule of Quarterly Financial Information [Line Items]
Common stock sales price per share				$ 116.32	$ 117.87	$ 121.92	$ 118.77	$ 113.34	$ 98.99	$ 83.80	$ 72.68