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Leases - Maturities (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Maturities of operating lease liabilities [Abstract]  
2020 $ 177
2021 159
2022 133
2023 89
2024 63
Thereafter 74
Total operating lease payments 695
Less: imputed interest, operating leases 64
Total operating lease liabilities 631
Maturities of finance lease liabilities [Abstract]  
2020 28
2021 21
2022 18
2023 8
2024 6
Thereafter 16
Total finance lease payments 97
Less: imputed interest, finance leases 9
Total finance lease liabilities $ 88