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Leases - Balance Sheet Classification of Lease Assets and Liabilities (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease assets $ 684
Finance lease assets 235
Total lease assets 919
Current operating lease liabilities 140
Finance lease obligations 78
Noncurrent operating lease liabilities 603
Finance lease and other financing obligations 144
Total lease liabilities $ 965