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Leases (Lease Assets and Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Operating leases $ 1,700 $ 1,812
Finance leases [1] 427 468
Total leased assets 2,127 2,280
Current liabilities operating leases (Note 16) 319 362
Current liabilities finance 105 114
Noncurrent liabilities operating 1,320 1,471
Noncurrent liabilities finance 427 491
Total lease liabilities 2,171 2,438
Accumulated depreciation 20,747 20,330
Finance Lease Assets [Member]    
Accumulated depreciation $ 774 $ 797
[1] Finance lease assets are recorded net of accumulated amortization of $774 million and $797 million as of June 30, 2020 and December 31, 2019.