Reclassification Adjustments Out of Accumulated Other Comprehensive Income (AOCI) Reclassification of Adjustments Out of Accumulated Other Comprehensive Income (AOCI) (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	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
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax									$ (8)	$ (5)	$ (2)
Income Tax Expense (Benefit)									206	407	341
Net earnings	386	103	213	304	270	353	325	350	1,006	1,298	1,345
Reclassification out of Accumulated Other Comprehensive Income [Member] | Marketable Securities Unrealized Gain (Loss)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax									(21)	(37)
Income Tax Expense (Benefit)									0	1
Net earnings									(21)	(36)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Plans
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax									7	2
Income Tax Expense (Benefit)									(2)	(1)
Net earnings									5	1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrecognized Gain (Loss) on Hedge
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax									(9)	0
Income Tax Expense (Benefit)									4	0
Net earnings									$ (5)	$ 0