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Shareholders' Equity AOCI Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 229 $ 200 $ 253
Cumulative Effect of New Accounting Principle in Period of Adoption 1   (6)
OCI before reclassifications (525) 54 (54)
Amounts reclassified from AOCI 6 (25) (5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (519) 29 (59)
Ending balance (291) 229 200
Net unrealized securities gains [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 486 [1] 479 [1] 426
Cumulative Effect of New Accounting Principle in Period of Adoption 1   (6)
OCI before reclassifications (458) 43 61
Amounts reclassified from AOCI (7) (36) (14)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (465) 7 47
Ending balance [1] 20 486 479
Noncredit related impairments on AFS securities 1 1 4
Net unrealized derivatives losses [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 8 5 1
Amounts reclassified from AOCI 0 3 4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0 3 4
Ending balance 8 8 5
Defined benefit plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (97) (125) (91)
OCI before reclassifications (36) 20 (39)
Amounts reclassified from AOCI 13 8 5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (23) 28 (34)
Ending balance (120) (97) (125)
Foreign currency translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (167) (159) (83)
OCI before reclassifications (31) (8) (76)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (31) (8) (76)
Ending balance (198) (167) (159)
Accumulated Net Unrealized From Other Investment Gain Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (1) 0 0
OCI before reclassifications 0 (1) 0
Amounts reclassified from AOCI 0 0 0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0 (1) 0
Ending balance $ (1) $ (1) $ 0
[1] Includes $1 million, $1 million and $4 million of noncredit related impairments on securities and net unrealized gains (losses) on previously impaired securities as of December 31, 2018, 2017 and 2016, respectively.