Income Taxes (Components Of Income Tax Provisions (Benefits)) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal	$ 189	$ 1,210	$ 1,382
State and local	27	152	135
Foreign	(1)	10	5
Total	215	1,372	1,522
Deferred
Federal	336	134	(199)
State and local	57	9	(37)
Foreign	1	(9)	(6)
Total	394	134	(242)
Total
Federal	525	1,344	1,183
State and local	84	161	98
Foreign	0	1	(1)
Total	$ 609	$ 1,506	$ 1,280