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Commitments and Contingencies - Noncancelable Operating Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |
Rent expense | $ 317 | $ 354 | $ 300
Operating lease liabilities | 969 | 1,010 |
Operating right-of-use assets obtained in exchange for lease obligations | 222 | $ 497 |
2021 | 251 |  |
2022 | 205 |  |
2023 | 196 |  |
2024 | 151 |  |
2025 | 122 |  |
Thereafter | 437 |  |
Imputed interest | $ 184 |  |
Weighted average discount rate | 4.00% | 4.20% |
Weighted-average remaining lease term | 7 years 4 months 24 days | 7 years 2 months 12 days |
Payments for operating leases | $ 309 | $ 337 |
Amount of lease agreements not yet commenced | 150 |  |
Other assets |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease right-of-use assets | 1,000 | 1,100 |
Accrued liabilities |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease liability | 209 | 239 |
Other liabilities |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease liabilities | $ 969 | $ 1,000 |

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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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