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Leases, Codification Topic 842 (Tables) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Lessee, Operating Lease, Disclosure
(Dollar amounts in millions)December 31, 2019
Operating assets and liabilities
  Operating right-of-use assets, net of amortization$218  
  Operating lease liabilities246
Weighted average remaining lease term (years)
  Operating leases9.1
  Finance leases20.2
Weighted average discount rate
  Operating leases3.2 %
  Finance leases3.1 %
  
Operating Lease, Liability $ 246  
Operating Lease, Weighted Average Remaining Lease Term 9 years 1 month 6 days  
Finance Lease, Weighted Average Remaining Lease Term 20 years 2 months 12 days  
Operating Lease, Weighted Average Discount Rate, Percent 3200000.00%  
Finance Lease, Weighted Average Discount Rate, Percent 3.10%  
Lease, Cost
(In millions)
Operating lease costs$48  
Variable lease costs53  
Total lease cost$101  
  
Operating Lease, Cost $ 48  
Variable Lease, Cost 53  
Lease, Cost $ 101  
Supplemental Cash Flow, Lease Related
(In millions)
Cash paid for amounts in the measurement of lease liabilities:
 Operating cash disbursements from operating leases$50  
  
Operating Lease, Lease Income $ 12 $ 11
Right of use assets obtained in exchange for lease liabilities
(In millions)
New operating lease liabilities$10  
New finance lease liabilities6  
Total$16  
  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 10  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 6  
Right-of-Use Asset Obtained in Exchange for Lease Liability $ 16  
Finance Lease, Liability, Maturity
(In millions)
2020$50  
202144  
202240  
202333  
202423  
Thereafter99  
Total$289  
  
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 50  
Lessee, Operating Lease, Liability, Payments, Due Year Two 44  
Lessee, Operating Lease, Liability, Payments, Due Year Three 40  
Lessee, Operating Lease, Liability, Payments, Due Year Four 33  
Lessee, Operating Lease, Liability, Payments, Due Year Five 23  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 99  
Lessee, Operating Lease, Liability, Payments, Due $ 289