Reclassification Adjustments Out of Accumulated Other Comprehensive Income (AOCI) Reclassification Adjustments Out of Accumulated Other Comprehensive Income (AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income taxes	$ 34	$ 91	$ 161	$ 319
Net earnings	103	353	620	1,028
Reclassification out of Accumulated Other Comprehensive Income [Member] | Marketable Securities Unrealized Gain (Loss)
Income (Loss) from Continuing Operations Attributable to Parent	(6)		(15)
Income taxes	(1)		1
Net earnings	(7)		(14)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Plans
Income taxes	0		(1)
Net earnings	2		4
Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	$ 2		$ 5