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Accumulated Other Comprehensive Income Loss - AOCI Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance       $ 13,101          
OCI, net of tax   $ 412 $ (166) 1,793 $ (2,177)        
Ending balance   16,078 12,729 16,078 12,729        
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect $ (88)                
Equity securities and shadow DAC [Member]                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of accounting changes, net of tax [1] 93                
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance 1,931 1,367 211 24 1,931        
Cumulative effect of accounting changes, net of tax [1]                 $ 273
Adjusted balance, beginning of period                 2,204
OCI before reclassifications   458 (183) 1,857 (2,213)        
Amounts reclassified from AOCI   (57) 12 (113) 49        
OCI, net of tax   401 (171) 1,744 (2,164)        
Ending balance   1,768 40 1,768 40        
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance (3) (3) (3) (4) (3)        
Cumulative effect of accounting changes, net of tax [1]                 0
Adjusted balance, beginning of period                 (3)
OCI before reclassifications   0 (1) 1 0        
Amounts reclassified from AOCI   0 0 0 (1)        
OCI, net of tax   0 (1) 1 (1)        
Ending balance   (3) (4) (3) (4)        
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance 18 11 (12) (5) 18        
Cumulative effect of accounting changes, net of tax [1]                 2
Adjusted balance, beginning of period                 20
OCI before reclassifications   8 1 27 (12)        
Amounts reclassified from AOCI   (2) (6) (5) (25)        
OCI, net of tax   6 (5) 22 (37)        
Ending balance   17 (17) 17 (17)        
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance 34 34 33 30 34        
Cumulative effect of accounting changes, net of tax [1]                 4
Adjusted balance, beginning of period                 38
OCI before reclassifications   (4) 1 0 (4)        
Amounts reclassified from AOCI   0 0 0 0        
OCI, net of tax   (4) 1 0 (4)        
Ending balance   30 34 30 34        
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance (1,317) (1,607) (1,582) (1,624) (1,317)        
Cumulative effect of accounting changes, net of tax [1]                 (284)
Adjusted balance, beginning of period                 (1,601)
OCI before reclassifications   1 1 1 0        
Amounts reclassified from AOCI   8 9 25 29        
OCI, net of tax   9 10 26 29        
Ending balance   (1,598) (1,572) (1,598) (1,572)        
AOCI Attributable to Parent [Member]                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Beginning balance $ 663 (198) (1,353) (1,579) 663        
Cumulative effect of accounting changes, net of tax [1]           $ 0 $ 0 $ 0 (5)
Adjusted balance, beginning of period           $ (198) $ (1,579) $ (1,353) $ 658
OCI before reclassifications   463 (181) 1,886 (2,229)        
Amounts reclassified from AOCI   (51) 15 (93) 52        
OCI, net of tax   412 (166) 1,793 (2,177)        
Ending balance   $ 214 (1,519) $ 214 (1,519)        
Discontinued Operations, Disposed of by Sale [Member]                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Disposal Group, Including Discontinued Operations, Adjustments to AOCI     $ 758   $ 758