Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.10.0.1
Income Taxes - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Jurisdiction
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Tax effect on common stock and additional paid in capital from employee stock purchase plan activity     $ 41
Expected U.S. federal income tax expense 21.00% 35.00% 35.00%
Estimated impact on net income (loss)   $ (2,900)  
Provisional income tax expense (benefit)   2,300  
Provisional investment valuation adjustment   (946)  
Provisional income tax expense (benefit), investments   (347)  
Estimated incremental income tax expense   1,900  
Unrecognized tax benefits that would impact effective rate $ 1,600 1,200 $ 600
Number of jurisdictions for filing income tax returns (more than) | Jurisdiction 100    
Decrease in unrecognized tax benefits, reasonably possible $ 1,200    
Penalties and interest expense 43 1 56
Penalties and interest accrued 218 185  
Provisional undistributed accumulated earnings of foreign subsidiary 5,000    
Provisional unrecognized deferred tax liability 1,000    
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), tax benefit $ 1,190 $ 1,229 $ 498