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Significant Accounting Policies - Noncancelable Operating Leases (Details) $ in Millions | Dec. 31, 2018 USD ($)
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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

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