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Income Taxes - Tax Credit Carryforwards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Tax Credit Carryforward [Line Items]      
Deferred tax assets not subject to expiration $ 38    
Undistributed foreign earnings 6,000   $ 9,000
Deferred tax liabilities on undistributed foreign earnings 1,656 $ 2,109 $ 3,000
Net deferred tax liabilities 1,669 2,303  
Tax savings $ 319 $ 339  
Increase in diluted earnings per share, tax benefits (in usd per share) $ 0.26 $ 0.27  
State Tax Credit Carryforward      
Tax Credit Carryforward [Line Items]      
Tax credit carryforward $ 58    
Federal Tax Credit Carryforward      
Tax Credit Carryforward [Line Items]      
Tax credit carryforward 336 $ 45  
Federal Tax Credit Carryforward | Discontinued Operations      
Tax Credit Carryforward [Line Items]      
Tax credit carryforward 291    
Tax Year 2017      
Tax Credit Carryforward [Line Items]      
Deferred tax assets subject to expiration 78    
Accrued Expenses and Other Current Liabilities      
Tax Credit Carryforward [Line Items]      
Deferred tax liabilities on undistributed foreign earnings   $ 2,100  
Other Long Term Liabilities      
Tax Credit Carryforward [Line Items]      
Net deferred tax liabilities $ 1,700