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Income Taxes - Tax Effected Operating Loss, Capital Loss, and Tax Credit Carryovers (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Income tax          
Net UTB impacting the effective tax rate   $ 679   $ 655  
Interest and penalties related to unrecognized tax benefits, expense (benefit) recognized on a gross basis   6 $ 9    
Interest and penalties related to unrecognized tax benefits, accrued on a gross basis   75   69  
Deferred tax assets valuation allowance   $ 84   $ 67  
Effective tax rate (as a percent)   17.90% 37.20%    
Increase (decrease) in effective income tax rate from prior reporting period to current reporting period (as a percent)   (19.30%)      
Statutory U.S. tax rate       21.00% 35.00%
Tax Cuts and Jobs Act of 2017 measurement period adjustment     $ 217    
Retained Earnings | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income          
Income tax          
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect $ 900        
Accumulated Other Comprehensive Income (Loss) | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income          
Income tax          
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect $ 900