Taxes on Income (Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 740	$ 747	$ 598
State	99	72	57
Total current	839	819	655
Deferred:
Federal	(6)	(23)	(20)
State	(1)	(2)	(1)
Total deferred	(7)	(25)	(21)
Taxes on income	$ 832	$ 794	$ 634