Taxes on Income (Income Tax Expense) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal		$ 1,132	$ 980	$ 740
State		106	109	99
Total current		1,238	1,089	839
Deferred:
Federal		58	13	(6)
State		0	2	(1)
Total deferred		58	15	(7)
Taxes on income	[1]	$ 1,296	$ 1,104	$ 832

[1] Includes the prospective adoption of ASU 2016-09 in 2017. See New Accounting Standards in Note 2 for additional information. Taxes on income were increased by approximately $46 million in December 2017 due to the enactment of the Tax Cuts and Jobs Act legislation resulting in the remeasurement of deferred tax assets and other tax adjustments.