Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles - New Accounting Pronouncements (Details)

v3.3.1.900
Summary of Significant Accounting Principles - New Accounting Pronouncements (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 01, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
New Accounting Pronouncement, Early Adoption [Line Items]              
Valuation adjustments on derivative liabilities, net         $ 153 $ 150 $ 75
Valuation adjustments on derivative liabilities, gross         18 28 39
Net income         $ 15,888 $ 4,833 $ 11,431
New Accounting Pronouncement, Early Adoption, Effect              
New Accounting Pronouncement, Early Adoption [Line Items]              
Reduction of earnings per share (in dollars per share)   $ 0.02 $ 0.02 $ 0.02      
New Accounting Pronouncement, Early Adoption, Effect | Other income              
New Accounting Pronouncement, Early Adoption [Line Items]              
Valuation adjustments on derivative liabilities, gross   $ 301 $ 301 $ 420      
Net income   (187) (186) (260)      
New Accounting Pronouncement, Early Adoption, Effect | Retained Earnings              
New Accounting Pronouncement, Early Adoption [Line Items]              
Valuation adjustments on derivative liabilities, net $ 1,200            
Valuation adjustments on derivative liabilities, gross 2,000            
New Accounting Pronouncement, Early Adoption, Effect | Accumulated Other Comprehensive Income (Loss)              
New Accounting Pronouncement, Early Adoption [Line Items]              
Valuation adjustments on derivative liabilities, net (1,200)            
Valuation adjustments on derivative liabilities, gross $ (2,000) $ (301) $ (301) $ (420)