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Leases - Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Other assets $ 521 $ 502
Other accruals 137 145
Other liabilities 476 491
Total operating lease liabilities $ 613 $ 636
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherAccruedLiabilitiesCurrent  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent