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Leases - Summary of Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Other assets $ 408 $ 469
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Liabilities:    
Accrued liabilities $ 153 $ 140
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Other noncurrent liabilities $ 306 $ 388
Total lease liabilities $ 459 $ 528