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Leases Summary of Minimum Lease Committments (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Remainder of 2020 $ 95
2021 107
2022 83
2023 62
2024 42
Thereafter 149
Total future lease payments 538
Less: leases not yet commenced (1) 61
Less: imputed interest 45
Total lease liabilities 415
Total lease liabilities 17
Total lease liabilities 432
Operating Lease [Member]  
Remainder of 2020 91
2021 101
2022 79
2023 58
2024 41
Thereafter 149
Total future lease payments 519
Less: leases not yet commenced (1) 61
Less: imputed interest 43
Total lease liabilities 415
Finance Lease [Member]  
Remainder of 2020 4
2021 6
2022 4
2023 4
2024 1
Thereafter 0
Total future lease payments 19
Less: leases not yet commenced (1) 0
Less: imputed interest 2
Total lease liabilities $ 17