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Leases Supplemental Balance Sheet Information (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Leases [Abstract]  
Operating Lease, Liability, Noncurrent $ 381
Operating Lease, Right-of-Use Asset 469
Operating Lease, Liability, Current 109
Total operating lease liabilities 490
Total finance lease liabilities 14
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 13
Finance Lease, Liability, Current 4
Finance Lease, Liability, Noncurrent $ 10