Accounting Changes - Leases (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|---|
| Leases | |||
| Operating right-of-use assets | $ 3,222 | $ 3,566 | $ 3,850 |
| Operating lease liabilities | 3,435 | ||
| Finance lease obligations | $ 99 | $ 91 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Present value of lessee's discounted obligation for lease payments from finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|