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Fair Value Measurements (Narrative) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) Year | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Guaranteed Living Benefits Lapse Rate Base Lower Range |  | 3.00% |  |
Guaranteed Living Benefits Lapse Rate Base Upper Range |  | 9.00% |  |
Guaranteed Living Benefits Lapse Rate Spike Lower Range |  | 9.00% |  |
GLB - spike lapse rate - upper range |  | 33.00% |  |
GLB - Ultimate lapse rate |  | 10.00% |  |
GLB - Length of ultimate lapse rate period, years | Year |  | 2 |  |
Guaranteed Living Benefits Adjustment Factor For Valuable Guarantees Lower Range |  | 15.00% |  |
Guaranteed Living Benefits Adjustment Factor For Valuable Guarantees Upper Range |  | 75.00% |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ (330) | $ 87 | $ (126)
Guaranteed Minimum Income Benefit |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | [1] | (248) | $ 364 | $ 53
Guaranteed Minimum Income Benefit | Variable Annuity [Member] | Measurement Input, Lapse Rate [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | 20 |  |
Guaranteed Minimum Income Benefit | Variable Annuity [Member] | Measurement Input, Withdrawal Rate [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | 11 |  |
Guaranteed Minimum Income Benefit | Variable Annuity [Member] | Measurement Input, Mortality Rate [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ 28 |  |
Minimum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Notice period for redemption for alternative investments investment funds, days |  | 5 days |  |
Maximum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Notice period for redemption for alternative investments investment funds, days |  | 120 days |  |
[1] | Excludes foreign exchange gains (losses) related to GLB.

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- Definition The high end of the range of multiplicative factors used to reduce the Base Lapse Function for policies with more valuable guarantees. + References No definition available. + Details
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- Definition The low end of the range of the per annum lapse assumption during the surrender charge period. + References No definition available. + Details
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- Definition The low end of the range of the per annum lapse assumption in the year immediately following the surrender charge period. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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