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Commitments, Contingencies, And Guarantees (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ (17) | $ (22) | $ 91 | $ 68 |
Derivative asset subject to a master netting agreement |  | 35 |  | 35 |  |
Derivative liability subject to a master netting agreement |  |  |  |  |  | $ 24
Repurchase agreements |  | 1,414 |  | 1,414 |  | $ 1,408
Purchase Commitment, Remaining Minimum Amount Committed |  | 867 |  | 867 |  |
Carrying value of limited partnerships and partially-owned investment companies included in other investments |  | 4,100 |  | 4,100 |  |
Funding commitments relating to limited partnerships and partially-owned investment companies |  | 3,200 |  | 3,200 |  |
Unrecognized tax benefits |  | 14 |  | 14 |  |
Guaranteed Minimum Income Benefit [Member] |  |  |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | [1] | 54 | 54 | 133 | 265 |
Single-Stock Future [Member] |  |  |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | [2] | $ (100) | $ (57) | (122) | $ (169) |
GLB and Future Contracts on Equity [Member] |  |  |  |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | [2] |  |  | $ 11 |  |
[1] | Excludes foreign exchange gains (losses) related to GLB.
[2] | Related to GMDB and GLB blocks of business.

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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