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Loans Payable, Long-Term Debt and Leases - Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Loans Payable, Long-Term Debt and Leases - Balance Sheet Information [Abstract]    
Other assets $ 1,725 $ 1,073
Accrued and other current liabilities 300 236
Other noncurrent liabilities 1,362 768
Total operating lease liability $ 1,662 $ 1,004
Weighted-average remaining lease term (years) 8 years 7 years 4 months 24 days
Weighted-average discount rate 2.80% 3.20%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets us-gaap:OtherAssets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent