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Leases (Details) - Contractual Maturities - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Leases [Abstract]      
Lease expense for real estate and other operating leases $ 185 $ 188  
Lease payments due, 2020     $ 108
Lease payments due, 2021     93
Lease payments due, 2022     71
Lease payments due, 2023     51
Lease payments due, 2024     35
Lease payments due, thereafter     54
Total undiscounted lease payments     412
Less: present value adjustment     32
Operating lease liability     $ 380