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Leases - Schedules of Components of Lease Expense, Supplemental Cash and Noncash And Balance Sheet Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Lease expense      
Operating lease expense $ 45 $ 38  
Sublease income (2) (1)  
Total lease expense 43 37  
Cash paid for amounts included in the measurement of lease liabilities      
Operating cash flows from operating leases 42 35  
Right-of-use assets obtained in exchange for operating lease liabilities 1 $ 244  
Operating lease right-of-use assets 663   $ 707
Other current lease liabilities 141   144
Operating lease liabilities 630   642
Total operating lease liabilities $ 771   $ 786
Weighted-average remaining lease term—operating leases 6 years 9 months 18 days   6 years 10 months 24 days
Weighted-average discount rate—operating leases 3.00%   3.00%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets   Other assets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses and other current liabilities   Accrued expenses and other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Deferred tax liability and other long-term liabilities   Deferred tax liability and other long-term liabilities