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Leases (Tables)
 12 Months Ended
Dec. 31, 2019
Leases [Abstract]  
Annual Future Minimum Lease Payments The undiscounted annual future minimum lease payments are summarized by year in the table below:
Maturity of Lease Liabilities
Operating Leases
(in millions)
2020
$
203

2021
172

2022
146

2023
132

2024
110

After 2024
342

Total lease payments
$
1,105

Less: interest
161

Present value of lease liabilities
$
944