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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
Dec. 31, 2022
Dec. 31, 2021
Assets    
Cash and cash equivalents $ 12,074 $ 13,118
Investments:    
Equity securities 5 326
Other long-term assets:    
Total assets at fair value 29,598 29,010
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Investments:    
Fair Value 679 640
Corporate securities    
Investments:    
Fair Value 9,361 8,200
Municipal securities    
Investments:    
Fair Value 3,781 3,468
Short-term time deposits    
Investments:    
Fair Value 204 109
Asset-backed securities    
Investments:    
Fair Value 1,326 1,308
Residential mortgage-backed securities    
Investments:    
Fair Value 1,046 853
Commercial mortgage-backed securities    
Investments:    
Fair Value 862 873
Level I    
Assets    
Cash and cash equivalents 12,074 13,118
Investments:    
Equity securities 3 324
Other long-term assets:    
Total assets at fair value 13,007 14,178
Level II    
Assets    
Cash and cash equivalents 0 0
Investments:    
Equity securities 2 2
Other long-term assets:    
Total assets at fair value 16,591 14,832
Level III    
Assets    
Cash and cash equivalents 0 0
Investments:    
Equity securities 0 0
Other long-term assets:    
Total assets at fair value 0 0
Investments    
Investments:    
Fair Value 16,307 14,809
Investments | U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Investments:    
Fair Value 371 171
Investments | Corporate securities    
Investments:    
Fair Value 9,328 8,170
Investments | Municipal securities    
Investments:    
Fair Value 3,165 2,999
Investments | Short-term time deposits    
Investments:    
Fair Value 204 109
Investments | Asset-backed securities    
Investments:    
Fair Value 1,326 1,308
Investments | Residential mortgage-backed securities    
Investments:    
Fair Value 1,046 853
Investments | Commercial mortgage-backed securities    
Investments:    
Fair Value 862 873
Investments | Level I    
Investments:    
Fair Value 369 495
Investments | Level I | U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Investments:    
Fair Value 366 171
Investments | Level I | Corporate securities    
Investments:    
Fair Value 0 0
Investments | Level I | Municipal securities    
Investments:    
Fair Value 0 0
Investments | Level I | Short-term time deposits    
Investments:    
Fair Value 0 0
Investments | Level I | Asset-backed securities    
Investments:    
Fair Value 0 0
Investments | Level I | Residential mortgage-backed securities    
Investments:    
Fair Value 0 0
Investments | Level I | Commercial mortgage-backed securities    
Investments:    
Fair Value 0 0
Investments | Level II    
Investments:    
Fair Value 15,938 14,314
Investments | Level II | U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Investments:    
Fair Value 5 0
Investments | Level II | Corporate securities    
Investments:    
Fair Value 9,328 8,170
Investments | Level II | Municipal securities    
Investments:    
Fair Value 3,165 2,999
Investments | Level II | Short-term time deposits    
Investments:    
Fair Value 204 109
Investments | Level II | Asset-backed securities    
Investments:    
Fair Value 1,326 1,308
Investments | Level II | Residential mortgage-backed securities    
Investments:    
Fair Value 1,046 853
Investments | Level II | Commercial mortgage-backed securities    
Investments:    
Fair Value 862 873
Investments | Level III    
Investments:    
Fair Value 0 0
Investments | Level III | U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Investments:    
Fair Value 0 0
Investments | Level III | Corporate securities    
Investments:    
Fair Value 0 0
Investments | Level III | Municipal securities    
Investments:    
Fair Value 0 0
Investments | Level III | Short-term time deposits    
Investments:    
Fair Value 0 0
Investments | Level III | Asset-backed securities    
Investments:    
Fair Value 0 0
Investments | Level III | Residential mortgage-backed securities    
Investments:    
Fair Value 0 0
Investments | Level III | Commercial mortgage-backed securities    
Investments:    
Fair Value 0 0
Restricted Deposits    
Investments:    
Fair Value 1,217 1,068
Restricted Deposits | U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Investments:    
Fair Value 308 469
Restricted Deposits | Corporate securities    
Investments:    
Fair Value 33 30
Restricted Deposits | Municipal securities    
Investments:    
Fair Value 616 469
Restricted Deposits | Cash and cash equivalents    
Investments:    
Fair Value 256 96
Restricted Deposits | Certificates of deposit    
Investments:    
Fair Value 4 4
Restricted Deposits | Level I    
Investments:    
Fair Value 564 565
Restricted Deposits | Level I | U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Investments:    
Fair Value 308 469
Restricted Deposits | Level I | Corporate securities    
Investments:    
Fair Value 0 0
Restricted Deposits | Level I | Municipal securities    
Investments:    
Fair Value 0 0
Restricted Deposits | Level I | Cash and cash equivalents    
Investments:    
Fair Value 256 96
Restricted Deposits | Level I | Certificates of deposit    
Investments:    
Fair Value 0 0
Restricted Deposits | Level II    
Investments:    
Fair Value 653 503
Restricted Deposits | Level II | U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Investments:    
Fair Value 0 0
Restricted Deposits | Level II | Corporate securities    
Investments:    
Fair Value 33 30
Restricted Deposits | Level II | Municipal securities    
Investments:    
Fair Value 616 469
Restricted Deposits | Level II | Cash and cash equivalents    
Investments:    
Fair Value 0 0
Restricted Deposits | Level II | Certificates of deposit    
Investments:    
Fair Value 4 4
Restricted Deposits | Level III    
Investments:    
Fair Value 0 0
Restricted Deposits | Level III | U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Investments:    
Fair Value 0 0
Restricted Deposits | Level III | Corporate securities    
Investments:    
Fair Value 0 0
Restricted Deposits | Level III | Municipal securities    
Investments:    
Fair Value 0 0
Restricted Deposits | Level III | Cash and cash equivalents    
Investments:    
Fair Value 0 0
Restricted Deposits | Level III | Certificates of deposit    
Investments:    
Fair Value $ 0 0
Other long-term Assets | Foreign currency swap agreement    
Other long-term assets:    
Derivative Asset   15
Other long-term Assets | Level I | Foreign currency swap agreement    
Other long-term assets:    
Derivative Asset   0
Other long-term Assets | Level II | Foreign currency swap agreement    
Other long-term assets:    
Derivative Asset   15
Other long-term Assets | Level III | Foreign currency swap agreement    
Other long-term assets:    
Derivative Asset   $ 0