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Leases - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Operating lease cost $ 236,000,000 $ 214,000,000  
Operating lease commitments, not yet commenced 49,000,000 49,000,000  
Financing lease commitments 0    
Operating lease commitments 1,161,000,000    
Long-term lease liabilities $ 838,000,000 $ 778,000,000  
Weighted average remaining lease term for operating lease 8 years 7 years  
Weighted average discount rate for operating lease 4.00% 4.00%  
Operating cash flow payments $ 234,000,000 $ 210,000,000  
Right-of-use asset obtained in exchange for operating lease liability 315,000,000 298,000,000  
Gain (loss) offset by terminations 68,000,000 $ 68,000,000  
Rent expense     $ 250,000,000
Residual value of lease arrangements $ 220,000,000    
Maximum      
Lessee, Lease, Description [Line Items]      
Operating lease term, not yet commenced 10 years