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Shareholders' Equity And Dividend Restrictions (Tables)
 12 Months Ended
Dec. 31, 2021
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)202120202019
Before
tax		Income
tax		NetBefore
tax		Income
tax		NetBefore
tax		Income
tax		Net
Investments:
AOCI, January 1$1,026 $215 $811 $590 $123 $467 $46 $9 $37 
OCI before investment gains and losses, net, recognized in net income(204)(44)(160)371 78 293 545 115 430 
Investment gains and losses, net, recognized in net income(30)(6)(24)65 14 51 (1)(1)— 
OCI(234)(50)(184)436 92 344 544 114 430 
AOCI, December 31$792 $165 $627 $1,026 $215 $811 $590 $123 $467 
Pension obligations:
AOCI, January 1$(41)$(7)$(34)$(9)$— $(9)$(16)$(2)$(14)
OCI excluding amortization recognized in net income62 12 50 (35)(7)(28)6 2 4 
Amortization recognized in net income6 2 4 3 — 3 1 — 1 
OCI68 14 54 (32)(7)(25)7 2 5 
AOCI, December 31$27 $7 $20 $(41)$(7)$(34)$(9)$— $(9)
Life deferred acquisition costs, life policy reserves and other:
AOCI, January 1$(10)$(2)$(8)$(13)$(3)$(10)$(1)$— $(1)
OCI before investment gains and losses, net, recognized in net income11 2 9 3 1 2 (15)(3)(12)
Investment gains and losses, net, recognized in net income— — — — — — 3 — 3 
OCI11 2 9 3 1 2 (12)(3)(9)
AOCI, December 31$1 $— $1 $(10)$(2)$(8)$(13)$(3)$(10)
Summary of AOCI:
AOCI, January 1$975 $206 $769 $568 $120 $448 $29 $7 $22 
Investments OCI(234)(50)(184)436 92 344 544 114 430 
Pension obligations OCI68 14 54 (32)(7)(25)7 2 5 
Life deferred acquisition costs, life policy reserves and other OCI11 2 9 3 1 2 (12)(3)(9)
Total OCI(155)(34)(121)407 86 321 539 113 426 
AOCI, December 31$820 $172 $648 $975 $206 $769 $568 $120 $448