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Loans Payable, Long-Term Debt and Leases - Balance Sheet Information (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Loans Payable, Long-Term Debt and Leases - Balance Sheet Information [Abstract]  
Other assets $ 1,073
Accrued and other current liabilities 236
Other noncurrent liabilities 768
Total operating lease liability $ 1,004
Weighted-average remaining lease term (years) 7 years 4 months 24 days
Weighted-average discount rate 3.20%