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Schedule I - Investments (Detail)
$ in Millions
Dec. 31, 2024
USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost $ 1,855
Fair Value 1,655
Amount at which shown in the balance sheet 1,655
Other Investments [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 1
Fair Value 1
Amount at which shown in the balance sheet 1
Assets Of Consolidated VIEs [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 37
Fair Value 28
Amount at which shown in the balance sheet 28
Loans Receivable [Member] | Assets Of Consolidated VIEs [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 37
Fair Value 28
Amount at which shown in the balance sheet 28
Long-Term Available-For-Sale [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 1,080
Fair Value 925
Amount at which shown in the balance sheet 925
Long-Term Available-For-Sale [Member] | U.S. Treasury And Government Agency [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 189
Fair Value 170
Amount at which shown in the balance sheet 170
Long-Term Available-For-Sale [Member] | US States And Political Subdivisions [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 110
Fair Value 101
Amount at which shown in the balance sheet 101
Long-Term Available-For-Sale [Member] | Foreign Governments [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 12
Fair Value 10
Amount at which shown in the balance sheet 10
Long-Term Available-For-Sale [Member] | Corporate Obligations [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 496
Fair Value 391
Amount at which shown in the balance sheet 391
Short-Term Available-For-Sale [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 311
Fair Value 311
Amount at which shown in the balance sheet 311
AFS Investments [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 1,391
Fair Value 1,236
Amount at which shown in the balance sheet 1,236
Investments At Fair Value [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 463
Fair Value 418
Amount at which shown in the balance sheet 418
Mortgage-backed [Member] | Long-Term Available-For-Sale [Member] | Residential Mortgage backed Agency [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 127
Fair Value 111
Amount at which shown in the balance sheet 111
Mortgage-backed [Member] | Long-Term Available-For-Sale [Member] | Residential Mortgage-Backed Non Agency [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 36
Fair Value 32
Amount at which shown in the balance sheet 32
Mortgage-backed [Member] | Long-Term Available-For-Sale [Member] | Commercial Mortgage-Backed [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 7
Fair Value 7
Amount at which shown in the balance sheet 7
Asset-backed [Member] | Long-Term Available-For-Sale [Member] | Collateralized Debt Obligations [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 71
Fair Value 72
Amount at which shown in the balance sheet 72
Asset-backed [Member] | Long-Term Available-For-Sale [Member] | Other Asset-Backed [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 32
Fair Value 31
Amount at which shown in the balance sheet $ 31