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Borrowings and Lines of Credit (Minimum Lease) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
Minimum lease commitments for operating leases, in 2018 $ 212
Minimum lease commitments for operating leases, in 2019 167
Minimum lease commitments for operating leases, in 2020 138
Minimum lease commitments for operating leases, in 2021 86
Minimum lease commitments for operating leases, in 2022 63
Minimum lease commitments for operating leases, thereafter $ 174