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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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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.

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