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, 2013	Dec. 31, 2012	Oct. 31, 2012	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Quarterly Financial Information [Line Items]
Revenues				$ 23,785	$ 22,130	$ 21,815	$ 18,893	$ 22,302	$ 20,008	$ 20,005	$ 19,383	$ 86,623	$ 81,698	$ 68,735
Total costs and expenses				(20,388)	(18,674)	(18,450)	(15,756)	(19,046)	(16,799)	(16,746)	(16,074)	(73,268)	(68,665)	(55,888)
Earnings from operations				1,515	1,803	1,716	1,528	1,624	1,559	1,542	1,565	6,562	6,290	5,823
Net earnings from continuing operations				1,233	1,160	1,087	1,106	978	1,034	967	924	4,586	3,903	4,011
Net (loss)/gain from disposal of discontinued operations					(2)	1			(2)		(1)	(1)	(3)	7
Net earnings				$ 1,233	$ 1,158	$ 1,088	$ 1,106	$ 978	$ 1,032	$ 967	$ 923	$ 4,585	$ 3,900	$ 4,018
Basic earnings per share from continuing operations				$ 1.63	$ 1.53	$ 1.43	$ 1.45	$ 1.29	$ 1.36	$ 1.28	$ 1.23	$ 6.03	$ 5.15	$ 5.38
Basic earnings per share				$ 1.63	$ 1.53	$ 1.43	$ 1.45	$ 1.29	$ 1.36	$ 1.28	$ 1.23	$ 6.03	$ 5.15	$ 5.39
Diluted earnings per share from continuing operations				$ 1.61	$ 1.51	$ 1.41	$ 1.44	$ 1.28	$ 1.35	$ 1.27	$ 1.22	$ 5.96	$ 5.11	$ 5.33
Diluted earnings per share				$ 1.61	$ 1.51	$ 1.41	$ 1.44	$ 1.28	$ 1.35	$ 1.27	$ 1.22	$ 5.96	$ 5.11	$ 5.34
Cash dividends declared, per share	$ 0.73	$ 0.485	$ 0.44	$ 1.215		$ 0.97		$ 0.925		$ 0.88		$ 2.185	$ 1.805	$ 1.70
Common stock sales price per share, Quarter end	$ 136.49	$ 75.36		$ 136.49	$ 117.50	$ 102.44	$ 85.85	$ 75.36	$ 69.60	$ 74.30	$ 74.37	$ 136.49	$ 75.36
Maximum [Member]
Schedule of Quarterly Financial Information [Line Items]
Common stock sales price per share				$ 142.00	$ 120.38	$ 104.15	$ 86.84	$ 76.56	$ 75.96	$ 77.83	$ 76.74
Minimum [Member]
Schedule of Quarterly Financial Information [Line Items]
Common stock sales price per share				$ 113.34	$ 98.99	$ 83.80	$ 72.68	$ 69.20	$ 69.03	$ 66.82	$ 72.30