Income Taxes (Unaudited) Income Taxes (Unaudited) (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Net earnings	$ 517	$ 531	$ 1,073	$ 1,015
New Accounting Pronouncement, Early Adoption, Effect [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Net earnings	$ 4		$ 84