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Leases (Lease Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating leases $ 1,610 $ 1,812
Finance leases [1] 370 468
Total leased assets 1,980 2,280
Current liabilities operating leases 321 362
Current liabilities finance leases 109 114
Noncurrent liabilities operating leases 1,283 1,471
Noncurrent liabilities finance leases 340 491
Total lease liabilities 2,053 2,438
Accumulated depreciation 21,259 20,330
Finance Lease Assets [Member]    
Accumulated depreciation $ 737 $ 797
[1] Finance lease assets are recorded net of accumulated amortization of $737 million and $797 million as of December 31, 2020 and 2019, respectively.