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Leases (Lease Assets and Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Operating leases $ 1,773 $ 1,812
Finance leases [1] 444 468
Total leased assets 2,217 2,280
Current liabilities operating leases 326 362
Current liabilities finance 119 114
Noncurrent liabilities operating 1,339 1,471
Noncurrent liabilities finance 433 491
Total lease liabilities 2,217 2,438
Accumulated depreciation 20,537 20,330
Finance Lease Assets [Member]    
Accumulated depreciation $ 766 $ 797
[1] Finance lease assets are recorded net of accumulated amortization of $766 million and $797 million as of March 31, 2020 and December 31, 2019.