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Commitments and Contingencies Lease Commitments - Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Future Minimum Lease Payments for Capital and Operating Leases [Line Items]      
Rent Expense for Operating Leases $ 627 $ 628 $ 594
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum capital lease payments - 2016 189    
Minimum capital lease payments - 2017 76    
Minimum capital lease payments - 2018 73    
Minimum capital lease payments - 2019 70    
Minimum capital lease payments - 2020 68    
Minimum capital lease payments - Thereafter 361    
Total minimum capital leases payments 837    
Capital lease payments - amount representing interest (177)    
Present value of minimum capital lease payments 660    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum operating lease payments - 2016 [1] 576    
Minimum operating lease payments - 2017 [1] 531    
Minimum operating lease payments - 2018 [1] 472    
Minimum operating lease payments - 2019 [1] 443    
Minimum operating lease payments - 2020 [1] 444    
Minimum operating lease payments - Thereafter [1] 1,526    
Total minimum operating lease payments [1] $ 3,992    
[1] Excludes leases having non-cancelable lease terms of less than one year and per diem leases.