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Shareholders' Equity AOCI Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances $ 5,729 $ 5,588 $ 5,995
Balances 5,867 5,729 5,588
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances 262 (291) 229
OCI before reclassifications 377 540 (525)
Amounts reclassified from AOCI (10) 13 6
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 367 553 (519)
Balances 629 262 (291)
Net unrealized securities gains [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances [1] 576 20 486
OCI before reclassifications 416 551 (458)
Amounts reclassified from AOCI (9) 5 (7)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 407 556 (465)
Balances [1] 983 576 20
Noncredit related impairments on AFS securities 0 1 1
Net unrealized derivatives losses [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances 6 8 8
Amounts reclassified from AOCI (1) (2)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (1) (2) 0
Balances 5 6 8
Defined benefit plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances (138) (120) (97)
OCI before reclassifications (66) (28) (36)
Amounts reclassified from AOCI   10 13
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (66) (18) (23)
Balances (204) (138) (120)
Foreign currency translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances (181) (198) (167)
OCI before reclassifications 27 17 (31)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 27 17 (31)
Balances (154) (181) (198)
Accumulated Net Unrealized From Other Investment Gain Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances (1) (1) (1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0 0 0
Balances $ (1) $ (1) (1)
Cumulative Effect, Period of Adoption, Adjustment [Member] | AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances     (1)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Net unrealized securities gains [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balances     $ (1)
[1] Includes nil, $1 million and $1 million of noncredit related impairments on securities and net unrealized gains (losses) on previously impaired securities as of December 31, 2020, 2019 and 2018, respectively.