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Significant Accounting Policies - Noncancelable Operating Leases (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Minimum commitments  
2019 $ 296
2020 286
2021 247
2022 180
2023 146
Thereafter 582
Total 1,737
Sublease income  
2019 (61)
2020 (51)
2021 (44)
2022 (38)
2023 (33)
Thereafter (129)
Totals (356)
Net minimum commitments  
2019 235
2020 235
2021 203
2022 142
2023 113
Thereafter 453
Totals $ 1,381