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Shareholders' Equity And Dividend Restrictions (Tables)
 12 Months Ended
Dec. 31, 2024
Shareholders Equity And Dividend Restrictions [Abstract]  
Change In AOCI Includes Changes In Unrealized Gains And Losses On Investments And Pension Obligations The changes from the beginning of year to the end of year are the result of changes to other comprehensive income or loss (OCI).
 (Dollars in millions)202420232022
Before
tax		Income
tax		NetBefore
tax		Income
tax		NetBefore
tax		Income
tax		Net
Investments:
AOCI, January 1$(570)$(123)$(447)$(847)$(182)$(665)$792 $165 $627 
OCI before investment gains and losses, net, recognized in net income(99)(20)(79)255 55 200 (1,642)(347)(1,295)
Investment gains and losses, net, recognized in net income116 24 92 22 4 18 3 — 3 
OCI17 4 13 277 59 218 (1,639)(347)(1,292)
AOCI, December 31$(553)$(119)$(434)$(570)$(123)$(447)$(847)$(182)$(665)
Pension obligations:
AOCI, January 1$30 $8 $22 $36 $9 $27 $27 $7 $20 
OCI excluding amortization recognized in net income44 9 35 2 1 1 12 2 10 
Amortization recognized in net income1 — 1 (8)(2)(6)(3)— (3)
OCI45 9 36 (6)(1)(5)9 2 7 
AOCI, December 31$75 $17 $58 $30 $8 $22 $36 $9 $27 
Life policy reserves, reinsurance recoverable and other:
AOCI, January 1$(13)$(3)$(10)$29 $5 $24 $(444)$(94)$(350)
OCI before investment gains and losses, net, recognized in net income98 21 77 (42)(8)(34)473 99 374 
Investment gains and losses, net, recognized in net income— — — — — — — — — 
OCI98 21 77 (42)(8)(34)473 99 374 
AOCI, December 31$85 $18 $67 $(13)$(3)$(10)$29 $5 $24 
Summary of AOCI:
AOCI, January 1$(553)$(118)$(435)$(782)$(168)$(614)$375 $78 $297 
Investments OCI17 4 13 277 59 218 (1,639)(347)(1,292)
Pension obligations OCI45 9 36 (6)(1)(5)9 2 7 
Life policy reserves, reinsurance recoverable and other OCI98 21 77 (42)(8)(34)473 99 374 
Total OCI160 34 126 229 50 179 (1,157)(246)(911)
AOCI, December 31$(393)$(84)$(309)$(553)$(118)$(435)$(782)$(168)$(614)