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Leases Lessee Disclosure - Lease Costs (Details)
ft² in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Lessee Disclosure - Lease Costs [Abstract]    
Operating Lease, Cost $ 150 $ 165
Finance Lease, Right-of-Use Asset, Amortization 12 13
Finance Lease, Interest Expense 2 2
Variable Lease, Cost [1] 24 28
Operating Lease, Impairment Loss [2] 46 12
Sublease Income 2 3
Lease, Cost $ 232 $ 217
Impaired or restructured lease | ft² 1  
[1] Primarily consists of variable lease costs.
[2] Impairment charges relate to the exit and sublease of certain real estate operating leases. As of December 31, 2020, the Company impaired or restructured approximately 1 million square feet which included its corporate headquarters in Madison, New Jersey and the relocation operations' main corporate location in Danbury, Connecticut resulting in additional impairment charges and restructuring charges. See Note 12, "Restructuring Costs", for further discussion.