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Summary of Significant Accounting Policies (Accounting Policies) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Accounting Change [Line Items]          
Provision for income taxes $ 18 $ 135 $ 302 $ 7,227  
Unamortized Debt Issuance Costs         $ 674
Variable Interest Entity Nonconsolidated Carrying Amount Assets And Liabilities Net         6,110
Net Assets And Noncontrolling Interest Decreases From Deconsolidation         $ 123
Deferred Compensation, Share-based Payments [Members]          
Accounting Change [Line Items]          
Provision for income taxes (41)   (97)    
Excess Tax Benefit From Share Based Compensation Operating Activities (59)   (137)    
Excess Tax Benefit From Share Based Compensation Financing Activities $ (59)   $ (137)