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Leases (Maturities of Lease Liabilities) (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Remaining six months ending December 31, 2019 $ 69
2020 152
2021 132
2022 73
2023 62
Thereafter 48
Total lease payments 536
Less imputed interest (39)
Total lease liabilities 497
Abandoned Leases [Member]  
Lessee, Lease, Description [Line Items]  
Total lease payments 200
Expected total future rental income to be received $ 158