Deferred Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs asset, beginning of period	$ 616	$ 578
Capitalized deferred policy acquisition costs	222	207
Deferred Policy Acquisition Cost, Amortization Expense	(212)	(209)
Deferred Policy Acquisition Cost, Amortization Expense, Other	(8)	(5)
Deferred policy acquisition costs asset, end of period	618	571
Life Insurance Product Line [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs asset, beginning of period	228	199
Capitalized deferred policy acquisition costs	12	11
Deferred Policy Acquisition Cost, Amortization Expense	(11)	(11)
Deferred Policy Acquisition Cost, Amortization Expense, Other	(8)	(5)
Deferred policy acquisition costs asset, end of period	221	194
Consolidated Property and Casualty Insurance Entity
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs asset, beginning of period	388	379
Capitalized deferred policy acquisition costs	210	196
Deferred Policy Acquisition Cost, Amortization Expense	(201)	(198)
Deferred policy acquisition costs asset, end of period	$ 397	$ 377