Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Jurisdiction
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Income Tax Disclosure [Abstract]      
Other comprehensive income (loss), tax $ (616) $ (3,371) $ 2,740
Tax effect on common stock and additional paid in capital from employee stock purchase plan activity (44) (35) (128)
Unrecognized tax benefits that would impact effective rate $ 700 700 2,500
Number of jurisdictions for filing income tax returns (more than) | Jurisdiction 100    
Unrecognized tax benefits is reasonable possible, amount of unrecorded benefit $ 100    
Penalties and interest expense (82) (196) $ 127
Penalties and interest accrued 288 $ 455  
Undistributed earnings of foreign subsidiaries 18,000    
Deferred tax liabilities, undistributed foreign earnings $ 5,000