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Debt (Principal Payments For Investment Agreements, MTNs and VIE Obligations) (Detail) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Debt Instrument [Line Items]

Total expected principal payments

$ 2,331

$ 2,229

Investment Agreement Obligations [Member]

Debt Instrument [Line Items]

2022

3

2023

19

2024

23

2025

35

2026

96

Thereafter

128

Total expected principal payments

^[1]

304

Less discount and other adjustments

^[2]

30

Total

274

Accrued interest

5

Carrying amount adjustment

$ 3

Latest maturity year

2037

Medium-term notes [Member]

Debt Instrument [Line Items]

2022

$ 52

2023

12

2024

54

2025

57

2026

0

Thereafter

606

Total expected principal payments

^[3]

781

Less discount and other adjustments

^[4]

191

Total

590

Accrued interest

3

Carrying amount adjustment

$ 29

Latest maturity year

2035

Variable Interest Entity Debt [Member] | International And Structured Finance Insurance [Member]

Debt Instrument [Line Items]

Latest maturity year

2038

Variable Interest Entity Debt [Member] | MBIA insured Variable Interest Entity [Member]

Debt Instrument [Line Items]

2022

$ 26

2023

21

2024

20

2025

18

2026

10

Thereafter

255

Total expected principal payments

$ 350

[1]	Amounts reflect principal due at maturity for investment agreements issued at a discount.
[2]	Discount is net of carrying amount adjustment of $3 million and accrued interest adjustment of $5 million.
[3]	Amounts reflect principal due at maturity for notes issued at a discount.
[4]	Discount is net of carrying amount and market value adjustments of $29 million and accrued interest adjustment of $3 million.

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