Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Non Variable Interest Entities [Line Items]
Federal statutory rate	35.00%	35.00%	35.00%
Deferred income taxes, net	$ 970	$ 939
Non U.S. deferred tax liability		12
Valuation allowance	7	0
NOL carryforward	2,700
Foreign tax credit	7	9
Unrecognized Tax Benefits	0	0	$ 0	$ 65
Alternative minimum tax credit carryforward	26	$ 22
Other Liabilities [Member]
Non Variable Interest Entities [Line Items]
Non U.S. deferred tax liability	$ 36