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Investments (Held-to-maturity credit quality indicator) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 10,153 | $ 11,697
Fixed Maturities Percent of Total Amortized cost | 100.00% | 100.00%
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $35 and $44 (fair value – $10,647 and $12,510) | $ 10,118 | $ 11,653
U.S. Treasury and agency |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | 1,213 | 1,392
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $35 and $44 (fair value – $10,647 and $12,510) | 1,213 | 1,392
Debt Security, Government, Non-US [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | 1,201 | 1,295
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $35 and $44 (fair value – $10,647 and $12,510) | 1,196 | 1,288
Corporate securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | 2,032 | 2,185
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $35 and $44 (fair value – $10,647 and $12,510) | 2,004 | 2,150
Mortgage-backed securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | 1,731 | 2,000
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $35 and $44 (fair value – $10,647 and $12,510) | 1,730 | 1,999
States, municipalities, and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | 3,976 | 4,825
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $35 and $44 (fair value – $10,647 and $12,510) | 3,975 | 4,824
Standard & Poor's, AAA Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 2,089 | $ 2,511
Fixed Maturities Percent of Total Amortized cost | 21.00% | 22.00%
Standard & Poor's, AA Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 5,303 | $ 6,193
Fixed Maturities Percent of Total Amortized cost | 52.00% | 53.00%
Standard & Poor's, A Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 1,964 | $ 2,138
Fixed Maturities Percent of Total Amortized cost | 19.00% | 18.00%
Standard & Poor's, BBB Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 773 | $ 826
Fixed Maturities Percent of Total Amortized cost | 8.00% | 7.00%
Standard & Poor's, BB Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 23 | $ 28
Fixed Maturities Percent of Total Amortized cost | 0.00% | 0.00%
Other [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 1 | $ 1
Fixed Maturities Percent of Total Amortized cost | 0.00% | 0.00%

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