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AOCI Rollforward (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance $ (5) $ 219 $ 229 $ 200    
OCI before reclassifications (170) 93 (399) 118    
Amounts reclassified from AOCI (4) (13) (8) (19)    
Total other comprehensive income (loss), net of tax (174) 80 (407) 99    
Ending balance (179) 299 (179) 299    
Net unrealized securities gains (losses) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance 223 486 486 479    
OCI before reclassifications (126) 70 (384) 89    
Amounts reclassified from AOCI (4) (13) (8) (25)    
Total other comprehensive income (loss), net of tax (130) 57 (392) 64    
Ending balance [1] 93 543 93 543    
AOCI Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total other comprehensive income (loss), net of tax     (407) 99    
Net unrealized derivatives gains (losses) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance 8 6 8 5    
OCI before reclassifications 0 0 0 0    
Amounts reclassified from AOCI 0 0 0 1    
Total other comprehensive income (loss), net of tax 0 0 0 1    
Ending balance 8 6 8 6    
Defined benefit plans [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance (97) (120) (97) (125)    
OCI before reclassifications 0 0 0 0    
Amounts reclassified from AOCI 0 0 0 5    
Total other comprehensive income (loss), net of tax 0 0 0 5    
Ending balance (97) (120) (97) (120)    
Foreign currency translation [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance (138) (152) (167) (159)    
OCI before reclassifications (44) 23 (15) 30    
Amounts reclassified from AOCI 0 0 0 0    
Total other comprehensive income (loss), net of tax (44) 23 (15) 30    
Ending balance (182) (129) (182) (129)    
Other [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance (1) (1) (1) 0    
OCI before reclassifications 0 0 0 (1)    
Amounts reclassified from AOCI 0 0 0 0    
Total other comprehensive income (loss), net of tax 0 0 0 (1)    
Ending balance [1] (1) $ (1) (1) $ (1)    
Cumulative effect of change in accounting policies - Recognition and measurement of financial instruments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative effect of change in accounting policies 0   0     $ (3)
Cumulative effect of change in accounting policies - Recognition and measurement of financial instruments | Net unrealized securities gains (losses) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative effect of change in accounting policies         $ (1)  
Cumulative effect of change in accounting policies - Recognition and measurement of financial instruments | AOCI Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative effect of change in accounting policies $ (1)   $ (1)   $ (1)  
[1] Includes $1 million and $4 million of noncredit related impairments on securities and net unrealized securities gains (losses) on previously impaired securities as of June 30, 2018 and June 30, 2017, respectively.