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Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
ASU 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating Leases, Future Minimum Payments Due   $ 450  
ASU 2016-15, Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Collections on Beneficial Interests Received in sales of Accounts Receivable and Finance Receivables   270 $ 305
ASU 2016-09, Stock Compensation: Improvements to Employee Share-Based Payment Accounting [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Stock Compensation Tax Expense Net Reclass from APIC to Income Taxes $ 2    
ASU 2016-18, Statement of Cash Flows [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Restricted Cash and Cash Equivalents $ 149 $ 179