Summary of Operating Results of Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Premiums																	$ 4,579	$ 4,700	$ 4,516
Net investment income																	3,138	3,142	3,155
Net investment gains (losses)																	(75)	(22)	(64)
Policy fees and other income																	906	909	1,018
Benefits and expenses:
Benefits and other changes in policy reserves																	5,149	6,418	4,737
Total benefits and expenses	$ 2,359	[1]	$ 2,451	[1]	$ 1,912	[1]	$ 1,841	[1]	$ 3,153	[2]	$ 3,170	[2]	$ 1,886	[2]	$ 1,819	[2]	8,563	10,028	7,632
Income (loss) from discontinued operations, net of taxes	(73)	[3]	$ (21)	[3]	$ (314)	[3]	$ 1	[3]	$ 138		$ 6		$ 4		$ 9		(407)	157	34
Wealth Management Business
Revenues:
Policy fees and other income																			211
Total revenues																			211
Benefits and expenses:
Acquisition and operating expenses																			178
Amortization of deferred acquisition costs and intangibles																			4
Total benefits and expenses																			182
Income (loss) before income taxes and loss on sale																			29
Provision (benefit) for income taxes																			12
Income (loss) before loss on sale																			17
Loss on sale, net of taxes																			(29)
Goodwill impairment and other loss from sale, net of taxes																			(29)
Income (loss) from discontinued operations, net of taxes																			(12)
Lifestyle Protection Insurance
Benefits and expenses:
Loss on sale, net of taxes	$ (63)
Assets Held For Sale Discontinued Operations | Lifestyle Protection Insurance
Revenues:
Premiums																	627	731	632
Net investment income																	74	100	116
Net investment gains (losses)																		2	27
Policy fees and other income																		3	3
Total revenues																	701	836	778
Benefits and expenses:
Benefits and other changes in policy reserves																	182	202	158
Acquisition and operating expenses																	396	447	415
Amortization of deferred acquisition costs and intangibles																	83	118	106
Interest expense																	29	46	42
Total benefits and expenses																	690	813	721
Income (loss) before income taxes and loss on sale																	11	23	57
Provision (benefit) for income taxes																	37	(134)	11
Income (loss) before loss on sale																	(26)	157	46
Loss on sale, net of taxes																	(381)
Income (loss) from discontinued operations, net of taxes																	$ (407)	$ 157	$ 46

[1] We completed our annual review of assumptions in the fourth quarter of 2015, which primarily resulted in $310 million of charges, which included $60 million of corrections related to reinsurance inputs, in our universal and term universal life insurance products. The updated assumptions reflected changes to persistency, long-term interest rates, mortality and other refinements. We also recorded an expected loss of $140 million related to the planned sale of our mortgage insurance business in Europe in the fourth quarter of 2015.

[2] During the fourth quarter of 2014, we completed our annual loss recognition testing of our long-term care insurance business which resulted in additional expenses of $735 million. During the fourth quarter of 2014, we also recorded goodwill impairments of $299 million in our U.S. Life Insurance segment. In the fourth quarter of 2014, we recorded a correction of $49 million in our life insurance business related to reserves on a reinsurance transaction. Our long-term care insurance claim reserves also increased in the fourth quarter of 2014 as a result of a $67 million unfavorable correction related to claims in course of settlement arising in connection with the implementation of our updated assumptions and methodologies as part of our comprehensive claims review completed in the third quarter of 2014, partially offset by a $43 million favorable refinement of assumptions for claim termination rates.

[3] We completed the sale of our lifestyle protection insurance business on December 1, 2015 and recorded an additional loss of $63 million, net of taxes, in the fourth quarter of 2015. The additional loss in the fourth quarter of 2015 was primarily related to the write off of currency translation adjustments on a holding company that was not part of the sale but related to our lifestyle protection insurance business that was substantially liquidated after the completion of the sale.