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Fair Value - Quantitative Information about Significant Unobservable Inputs Utilized by Company in Fair Value Measurements of Level 3 Assets (Detail) $ in Millions | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair value | $ 40,525 | $ 39,542
Level 3 [Member] | Fixed Maturity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair value | $ 293 | $ 228
Minimum [Member] | Level 3 [Member] | Credit Spread [Member] | Discounted Cash Flow [Member] | Fixed Maturity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Measurement input | 0.01 | 0.01
Maximum [Member] | Level 3 [Member] | Credit Spread [Member] | Discounted Cash Flow [Member] | Fixed Maturity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Measurement input | 0.05 | 0.12
Weighted Average [Member] | Level 3 [Member] | Credit Spread [Member] | Discounted Cash Flow [Member] | Fixed Maturity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Measurement input | 0.03 | 0.03

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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