Leases Operating and Finance Lease Reconciliation (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Gross lease liabilities - operating leases	$ 31,963
Gross lease liabilities - finance leases	28,875
Gross lease liabilities	60,838
Impute interest - operating leases	6,128
Imputed interest - finance leases	1,896
Imputed interest	(8,024)
Present value of operating leases	25,835
Present value of finance leases	26,979
Present value of lease liabilities	52,814
Current portion of operating leases	3,139
Current portion of finance leases	9,884
Current portion of lease liabilities	(13,023)
Total long-term operating lease liabilities	22,696
Total long-term finance lease liabilities	17,095
Long-term lease liabilities	$ 39,791	$ 9,650