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Shareholders' Equity And Dividend Restrictions (Tables)
 12 Months Ended
Dec. 31, 2022
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)202220212020
Before
tax		Income
tax		NetBefore
tax		Income
tax		NetBefore
tax		Income
tax		Net
Investments:
AOCI, January 1$792 $165 $627 $1,026 $215 $811 $590 $123 $467 
OCI before investment gains and losses, net, recognized in net income(1,642)(347)(1,295)(204)(44)(160)371 78 293 
Investment gains and losses, net, recognized in net income3 — 3 (30)(6)(24)65 14 51 
OCI(1,639)(347)(1,292)(234)(50)(184)436 92 344 
AOCI, December 31$(847)$(182)$(665)$792 $165 $627 $1,026 $215 $811 
Pension obligations:
AOCI, January 1$27 $7 $20 $(41)$(7)$(34)$(9)$— $(9)
OCI excluding amortization recognized in net income12 2 10 62 12 50 (35)(7)(28)
Amortization recognized in net income(3)— (3)6 2 4 3 — 3 
OCI9 2 7 68 14 54 (32)(7)(25)
AOCI, December 31$36 $9 $27 $27 $7 $20 $(41)$(7)$(34)
Life deferred acquisition costs, life policy reserves and other:
AOCI, January 1$1 $— $1 $(10)$(2)$(8)$(13)$(3)$(10)
OCI before investment gains and losses, net, recognized in net income1 — 1 11 2 9 3 1 2 
Investment gains and losses, net, recognized in net income— — — — — — — — — 
OCI1 — 1 11 2 9 3 1 2 
AOCI, December 31$2 $— $2 $1 $— $1 $(10)$(2)$(8)
Summary of AOCI:
AOCI, January 1$820 $172 $648 $975 $206 $769 $568 $120 $448 
Investments OCI(1,639)(347)(1,292)(234)(50)(184)436 92 344 
Pension obligations OCI9 2 7 68 14 54 (32)(7)(25)
Life deferred acquisition costs, life policy reserves and other OCI1 — 1 11 2 9 3 1 2 
Total OCI(1,629)(345)(1,284)(155)(34)(121)407 86 321 
AOCI, December 31$(809)$(173)$(636)$820 $172 $648 $975 $206 $769