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Fair Value Measurements - Fair Value Measurements by Level for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 13,423 | $ 10,800
Investments: |  |
Equity securities | 317 | 318
Other current assets: |  |
Total assets at fair value | 28,893 | 25,287
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Assets measured at fair value | 656 | 911
Corporate securities |  |
Investments: |  |
Assets measured at fair value | 7,827 | 6,814
Municipal securities |  |
Investments: |  |
Assets measured at fair value | 3,470 | 3,097
Short-term time deposits |  |
Investments: |  |
Assets measured at fair value | 78 | 53
Asset-backed securities |  |
Investments: |  |
Assets measured at fair value | 1,148 | 1,164
Residential mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 911 | 1,095
Commercial mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 830 | 773
Investments available-for-sale |  |
Investments: |  |
Assets measured at fair value | 14,338 | 13,427
Investments available-for-sale | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Assets measured at fair value | 216 | 165
Investments available-for-sale | Corporate securities |  |
Investments: |  |
Assets measured at fair value | 7,796 | 6,789
Investments available-for-sale | Municipal securities |  |
Investments: |  |
Assets measured at fair value | 3,042 | 3,070
Investments available-for-sale | Short-term time deposits |  |
Investments: |  |
Assets measured at fair value | 78 | 53
Investments available-for-sale | Asset-backed securities |  |
Investments: |  |
Assets measured at fair value | 1,148 | 1,164
Investments available-for-sale | Residential mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 911 | 1,095
Investments available-for-sale | Commercial mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 830 | 773
Restricted deposits |  |
Investments: |  |
Assets measured at fair value | 1,114 | 1,060
Restricted deposits | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Assets measured at fair value | 440 | 746
Restricted deposits | Corporate securities |  |
Investments: |  |
Assets measured at fair value | 31 | 25
Restricted deposits | Municipal securities |  |
Investments: |  |
Assets measured at fair value | 428 | 27
Restricted deposits | Cash and cash equivalents |  |
Investments: |  |
Assets measured at fair value | 211 | 157
Restricted deposits | Certificates of deposit |  |
Investments: |  |
Assets measured at fair value | 4 | 105
Other current assets | Foreign currency swap agreement |  |
Other current assets: |  |
Foreign currency swap agreement | 18 |
Level I |  |
Assets |  |
Cash and cash equivalents | 13,423 | 10,800
Investments: |  |
Equity securities | 315 | 316
Other current assets: |  |
Total assets at fair value | 14,605 | 12,184
Level I | Investments available-for-sale |  |
Investments: |  |
Assets measured at fair value | 531 | 481
Level I | Investments available-for-sale | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Assets measured at fair value | 216 | 165
Level I | Investments available-for-sale | Corporate securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level I | Investments available-for-sale | Municipal securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level I | Investments available-for-sale | Short-term time deposits |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level I | Investments available-for-sale | Asset-backed securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level I | Investments available-for-sale | Residential mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level I | Investments available-for-sale | Commercial mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level I | Restricted deposits |  |
Investments: |  |
Assets measured at fair value | 651 | 903
Level I | Restricted deposits | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Assets measured at fair value | 440 | 746
Level I | Restricted deposits | Corporate securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level I | Restricted deposits | Municipal securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level I | Restricted deposits | Cash and cash equivalents |  |
Investments: |  |
Assets measured at fair value | 211 | 157
Level I | Restricted deposits | Certificates of deposit |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level I | Other current assets | Foreign currency swap agreement |  |
Other current assets: |  |
Foreign currency swap agreement | 0 |
Level II |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Investments: |  |
Equity securities | 2 | 2
Other current assets: |  |
Total assets at fair value | 14,288 | 13,103
Level II | Investments available-for-sale |  |
Investments: |  |
Assets measured at fair value | 13,807 | 12,946
Level II | Investments available-for-sale | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level II | Investments available-for-sale | Corporate securities |  |
Investments: |  |
Assets measured at fair value | 7,796 | 6,789
Level II | Investments available-for-sale | Municipal securities |  |
Investments: |  |
Assets measured at fair value | 3,042 | 3,070
Level II | Investments available-for-sale | Short-term time deposits |  |
Investments: |  |
Assets measured at fair value | 78 | 53
Level II | Investments available-for-sale | Asset-backed securities |  |
Investments: |  |
Assets measured at fair value | 1,148 | 1,164
Level II | Investments available-for-sale | Residential mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 911 | 1,095
Level II | Investments available-for-sale | Commercial mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 830 | 773
Level II | Restricted deposits |  |
Investments: |  |
Assets measured at fair value | 463 | 157
Level II | Restricted deposits | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level II | Restricted deposits | Corporate securities |  |
Investments: |  |
Assets measured at fair value | 31 | 25
Level II | Restricted deposits | Municipal securities |  |
Investments: |  |
Assets measured at fair value | 428 | 27
Level II | Restricted deposits | Cash and cash equivalents |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level II | Restricted deposits | Certificates of deposit |  |
Investments: |  |
Assets measured at fair value | 4 | 105
Level II | Other current assets | Foreign currency swap agreement |  |
Other current assets: |  |
Foreign currency swap agreement | 18 |
Level III |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Investments: |  |
Equity securities | 0 | 0
Other current assets: |  |
Total assets at fair value | 0 | 0
Level III | Investments available-for-sale |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Investments available-for-sale | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Investments available-for-sale | Corporate securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Investments available-for-sale | Municipal securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Investments available-for-sale | Short-term time deposits |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Investments available-for-sale | Asset-backed securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Investments available-for-sale | Residential mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Investments available-for-sale | Commercial mortgage-backed securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Restricted deposits |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Restricted deposits | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Restricted deposits | Corporate securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Restricted deposits | Municipal securities |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Restricted deposits | Cash and cash equivalents |  |
Investments: |  |
Assets measured at fair value | 0 | 0
Level III | Restricted deposits | Certificates of deposit |  |
Investments: |  |
Assets measured at fair value | 0 | $ 0
Level III | Other current assets | Foreign currency swap agreement |  |
Other current assets: |  |
Foreign currency swap agreement | $ 0 |

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