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Changes in and Reclassifications from Accumulated Other Comprehensive Income - AOCI Rollforward - USD ($)
$ in Millions
3 Months Ended
Jan. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance $ 6,680 $ 6,680      
OCI, net of tax   (321) $ 37    
Ending Balance   6,486 7,635    
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings   193      
Net unrealized gain on securities          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 1,022 1,022 693    
Cumulative effect of accounting change       $ 182  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance       1,204  
OCI, before Reclassifications 11 (301) 58    
Amounts reclassified from AOCI   (3) (14)    
OCI, net of tax   (304) 44    
Ending Balance   900 737    
Net gains on cash flow hedging instruments          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 4 4 32    
Cumulative effect of accounting change       0  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance       4  
OCI, before Reclassifications   (12) (2)    
Amounts reclassified from AOCI   (6) (5)    
OCI, net of tax   (18) (7)    
Ending Balance   (14) 25    
Foreign Currency Translation Adjustments          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance (3) (3) (3)    
Cumulative effect of accounting change       0  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance       (3)  
OCI, before Reclassifications   1 0    
Amounts reclassified from AOCI   0 0    
OCI, net of tax   1 0    
Ending Balance   (2) (3)    
AOCI, net of tax          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance $ 1,023 1,023 722    
Cumulative effect of accounting change       182 $ 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance       $ 1,205 $ 722
OCI, before Reclassifications   (312) 56    
Amounts reclassified from AOCI   (9) (19)    
OCI, net of tax   (321) 37    
Ending Balance   $ 884 $ 759