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Leases (Lease Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Operating leases $ 1,642 $ 1,812
Finance leases [1] 444 468
Total leased assets 2,086 2,280
Current liabilities operating leases (Note 16) 308 362
Current liabilities finance 95 114
Noncurrent liabilities operating 1,293 1,471
Noncurrent liabilities finance 374 491
Total lease liabilities 2,070 2,438
Accumulated depreciation 21,012 20,330
Finance Lease Assets [Member]    
Accumulated depreciation $ 723 $ 797
[1] Finance lease assets are recorded net of accumulated amortization of $723 million and $797 million as of September 30, 2020, and December 31, 2019.