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AOCI Rollforward (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance $ 35 $ (5) $ (291) $ 229    
Cumulative effect of change in accounting policies         $ 5 $ 0
OCI before reclassifications 234 (170) 565 (399)    
Amounts reclassified from AOCI 0 (4) (5) (8)    
Total other comprehensive income (loss), net of tax 234 (174) 560 (407)    
Ending balance 269 (179) 269 (179)    
Net unrealized gains (losses) on securities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance 342 223 20 486    
OCI before reclassifications 248 (126) 574 (384)    
Amounts reclassified from AOCI 0 (4) (4) (8)    
Total other comprehensive income (loss), net of tax 248 (130) 570 (392)    
Ending balance [1] 590 93 590 93    
Net unrealized gains (losses) on derivatives [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance 7 8 8 8    
OCI before reclassifications 0 0 0 0    
Amounts reclassified from AOCI 0 0 (1) 0    
Total other comprehensive income (loss), net of tax 0 0 (1) 0    
Ending balance 7 8 7 8    
Defined benefit plans [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance (120) (97) (120) (97)    
OCI before reclassifications 0 0 0 0    
Amounts reclassified from AOCI 0 0 0 0    
Total other comprehensive income (loss), net of tax 0 0 0 0    
Ending balance (120) (97) (120) (97)    
Foreign currency translation [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance (193) (138) (198) (167)    
OCI before reclassifications (14) (44) (9) (15)    
Amounts reclassified from AOCI 0 0 0 0    
Total other comprehensive income (loss), net of tax (14) (44) (9) (15)    
Ending balance (207) (182) (207) (182)    
Other [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance (1) (1) (1) (1)    
OCI before reclassifications 0 0 0 0    
Amounts reclassified from AOCI 0 0 0 0    
Total other comprehensive income (loss), net of tax 0 0 0 0    
Ending balance [1] $ (1) $ (1) $ (1) $ (1)    
Cumulative effect of adoption of equity securities guidance            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative effect of change in accounting policies           1
Cumulative effect of adoption of equity securities guidance | Net unrealized gains (losses) on securities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative effect of change in accounting policies           $ 1
[1] Includes $(1) million and $1 million of noncredit related impairments on securities and net unrealized gains (losses) on previously impaired securities as of June 30, 2019 and June 30, 2018, respectively.