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Income Taxes Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Provision (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]                        
Current income tax benefit (provision)                   $ 600 $ (2,014) $ 271
Deferred income tax provision                   (16,584) (4,006) (5,524)
Provision for federal income taxes   $ (11,489) $ (1,525) $ (1,587) $ (1,383) $ (2,545) $ (1,527) $ (1,398) $ (550) (15,984) $ (6,020) $ (5,253)
Income Taxes Receivable   $ 3,700               $ 3,700    
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]                        
Statutory corporate tax rate 21.00%                 35.00% 35.00% 35.00%
Equity investments in affordable housing projects                   (1.40%) (1.90%) (2.60%)
Effect of corporate tax rate change                   53.60% 0.00% 0.00%
Other                   (0.60%) (0.30%) 0.90%
Valuation allowance                   0.00% 0.00% (0.90%)
Effective tax rate                   86.60% 32.80% 32.40%