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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	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
Net earnings	$ 413us-gaap_NetIncomeLoss	$ 1,639us-gaap_NetIncomeLoss	$ 439us-gaap_NetIncomeLoss	$ 468us-gaap_NetIncomeLoss	$ 470us-gaap_NetIncomeLoss	$ 494us-gaap_NetIncomeLoss	$ 472us-gaap_NetIncomeLoss	$ 443us-gaap_NetIncomeLoss	$ 2,959us-gaap_NetIncomeLoss	$ 1,879us-gaap_NetIncomeLoss	$ 1,574us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total other comprehensive income (loss), net of tax									(190)	24	(130)
Other comprehensive income (loss), before reclassifications, net of tax									(183)	158
Reclassifications from accumulated other comprehensive income (loss) to net earnings									(7)	(134)
Total comprehensive income (loss)									2,769us-gaap_ComprehensiveIncomeNetOfTax	1,903us-gaap_ComprehensiveIncomeNetOfTax	1,444us-gaap_ComprehensiveIncomeNetOfTax
Continuing Operations [Member]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Cumulative translation adjustment									(8)	(2)	9
Net actuarial gain (loss) and prior service cost									(163)	207	(136)
Unrealized gain on securities									(3)	1	0
Changes in fair value of cash flow hedges									(1)	0	0
Total other comprehensive income (loss), net of tax									(175)	206	(127)
Discontinued Operations [Member]
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total other comprehensive income (loss), net of tax									(15)	(182)	(3)
Other comprehensive income (loss), before reclassifications, net of tax									15	(4)	(3)
Reclassifications from accumulated other comprehensive income (loss) to net earnings									$ (30)	$ (178)	$ 0