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Leases - Schedule of Company's Lease Liabilities' Maturities For Subsequent Five Years and Thereafter under Previous Lease Accounting Standard (Details) $ in Millions	Dec. 31, 2018 USD ($)
Operating Leases
2019	$ 92
2020	70
2021	59
2022	42
2023	27
Thereafter	134
Total lease payments	424
Finance Leases
2020	2
Total lease payments	2
Operating and Finance Leases, Total
2019	92
2020	72
2021	59
2022	42
2023	27
Thereafter	134
Total lease payments	$ 426

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