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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

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