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Variable Interest Entities and Asset Securitizations - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Variable Interest Entity Disclosure [Abstract]          
Carrying value of loans in the Securitization trusts         $ 81,000,000
Combined outstanding principal amount of mortgage-backed securities issued by qualified special purpose trust held by unrelated parties         13,000,000
Other assets for its "investment" in the common securities recognized by the company of various trusts $ 24,000,000   $ 24,000,000   24,000,000
Total assets of partnerships in which the company invested 1,100,000,000   1,100,000,000   1,100,000,000
Maximum exposure to loss of investments in real estate partnerships 279,000,000   279,000,000   295,000,000
Unfunded commitments included in company's maximum exposure to loss of investments in real estate partnerships 70,000,000   70,000,000   $ 78,000,000
Investments amortized to income tax expense 11,000,000 $ 11,000,000 22,000,000 $ 21,000,000  
Federal tax credits and other federal tax benefits recognized $ 14,000,000 $ 15,000,000 $ 28,000,000 $ 29,000,000