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Commitments and Contingencies Noncancelable Operating Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 |  |
Rental expense under operating leases | $ 300 | $ 284 | $ 270

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