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Investments (Internal Credit Rating Disclosure) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 8,493 $ 7,459
High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4,401 4,212
Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 3,694 2,928
Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 263 296
Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 23 7
Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 112 16
Year Of Origination 2024    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,082  
Year Of Origination 2024 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 352  
Year Of Origination 2024 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 730  
Year Of Origination 2024 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0  
Year Of Origination 2024 | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0  
Year Of Origination 2024 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0  
Year Of Origination 2023    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,237 1,241
Year Of Origination 2023 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 473 475
Year Of Origination 2023 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 752 754
Year Of Origination 2023 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 12 12
Year Of Origination 2023 | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2023 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2022    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,369 1,303
Year Of Origination 2022 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 641 635
Year Of Origination 2022 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 728 668
Year Of Origination 2022 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2022 | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2022 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2021    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 1,055 957
Year Of Origination 2021 | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 613 573
Year Of Origination 2021 | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 442 384
Year Of Origination 2021 | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2021 | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2021 | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2020 [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 525 567
Year Of Origination 2020 [Member] | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 268 304
Year Of Origination 2020 [Member] | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 239 245
Year Of Origination 2020 [Member] | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 18 18
Year Of Origination 2020 [Member] | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2020 [Member] | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 0 0
Year Of Origination 2019 [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   867
Year Of Origination 2019 [Member] | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   491
Year Of Origination 2019 [Member] | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   313
Year Of Origination 2019 [Member] | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   63
Year Of Origination 2019 [Member] | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   0
Year Of Origination 2019 [Member] | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   0
Year Of Origination Prior Periods [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 3,225 2,524
Year Of Origination Prior Periods [Member] | High Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 2,054 1,734
Year Of Origination Prior Periods [Member] | Internal Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 803 564
Year Of Origination Prior Periods [Member] | Average Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 233 203
Year Of Origination Prior Periods [Member] | Internal Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 23 7
Year Of Origination Prior Periods [Member] | Watch List [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 112 $ 16