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Leases Lessee (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Lessee, Lease, Description [Line Items]          
Operating Lease, Residual Value of Leased Asset $ 278   $ 278    
Lease charges 62 $ 64 119 $ 120  
Operating lease right-of-use assets 2,409   2,409   $ 0
Operating Lease, Liability, Current 433   433    
Long-term operating lease liabilities 1,995   1,995   0
Operating Leases, Future Minimum Payments Due, Next Twelve Months         835
Operating Leases, Future Minimum Payments, Due in Two Years         476
Operating Leases, Future Minimum Payments, Due in Three Years         345
Operating Leases, Future Minimum Payments, Due in Four Years         253
Operating Leases, Future Minimum Payments, Due in Five Years         162
Operating Leases, Future Minimum Payments, Due Thereafter         590
Operating Leases, Future Minimum Payments Due         $ 2,661
Property leases [Member]          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 179   356    
Variable Lease, Cost 74   126    
Sublease Income (3)   (4)    
Lease, Cost 250   478    
Operating lease right-of-use assets 2,409   2,409    
Long-term operating lease liabilities 1,995   1,995    
Operating Lease, Liability $ 2,428   $ 2,428    
Operating Lease, Weighted Average Remaining Lease Term 9 years 6 months   9 years 6 months    
Operating Lease, Weighted Average Discount Rate, Percent 4.57%   4.57%    
Operating Lease, Payments     $ 378    
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability     17    
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months $ 531   531    
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two 420   420    
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three 360   360    
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four 297   297    
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five 229   229    
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five 1,199   1,199    
Lessee, Operating Lease, Liability, Payments, Due 3,036   3,036    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (608)   (608)    
Vehicle leases [Member]          
Lessee, Lease, Description [Line Items]          
Lease, Cost 75   144    
Finance Lease, Right-of-Use Asset, Amortization 12   23    
Finance Lease, Interest Expense 1   2    
Operating lease right-of-use assets 216   216    
Operating Lease, Liability, Current 170   170    
Long-term operating lease liabilities 46   46    
Operating Lease, Liability $ 216   $ 216    
Operating Lease, Weighted Average Remaining Lease Term 2 years 2 months 12 days   2 years 2 months 12 days    
Operating Lease, Weighted Average Discount Rate, Percent 2.89%   2.89%    
Finance Lease, Right-of-Use Asset, Gross $ 332   $ 332    
Finance Lease, Right-of-Use Asset, Accumulated Amortization (53)   (53)    
Finance Lease, Right-of-Use Asset 279   279    
Finance Lease, Liability, Current 105   105    
Finance Lease, Liability, Noncurrent 141   141    
Finance Lease, Liability $ 246   $ 246    
Finance Lease, Weighted Average Remaining Lease Term 1 year 7 months 6 days   1 year 7 months 6 days    
Finance Lease, Weighted Average Discount Rate, Percent 1.48%   1.48%    
Operating Lease, Payments     $ 105    
Finance Lease, Interest Payment on Liability     2    
Finance Lease, Principal Payments     90    
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability     136    
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability     133    
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months $ 149   149    
Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months 105   105    
Finance Lease, Liability, Payments, Due in Rolling Year Two 7   7    
Finance Lease, Liability, Payments, Due in Rolling Year Three 129   129    
Finance Lease, Liability, Payments, Due in Rolling Year Four 5   5    
Finance Lease, Liability, Payments, Due in Rolling Year Five 0   0    
Finance Lease, Liability, Payments, Due in Rolling after Year Five 0   0    
Finance Lease, Liability, Payment, Due 246   246    
Finance Lease, Liability, Undiscounted Excess Amount 0   0    
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two 56   56    
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three 14   14    
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four 3   3    
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five 0   0    
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five 0   0    
Lessee, Operating Lease, Liability, Payments, Due 222   222    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount $ (6)   $ (6)