Short-term Investments (Components of Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 8,664	$ 7,228
Unrealized Gains	0	0
Unrealized Losses	(10)	(1)
Fair Value	8,654	7,227
Cash	4,665	3,612
Short-term investments and cash	13,319	10,839
Commercial Paper [Member] \| Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,300	4,905
Unrealized Gains	0	0
Unrealized Losses	(6)	(1)
Fair Value	3,294	4,904
Certificates of deposit and time deposits \| Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,313	2,024
Unrealized Gains	0	0
Unrealized Losses	(4)	0
Fair Value	5,309	2,024
U.S. government securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23	28
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	23	28
Corporate notes and bonds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28	271
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	28	271
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	4,413	1,679
Cash	4,665	3,612
Short-term investments and cash	9,078	5,291
Cash and Cash Equivalents \| Commercial Paper [Member] \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	583	868
Cash and Cash Equivalents \| Certificates of deposit and time deposits \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	3,830	750
Cash and Cash Equivalents \| U.S. government securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Cash and Cash Equivalents \| Corporate notes and bonds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	61
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	4,241	5,548
Cash	0	0
Short-term investments and cash	4,241	5,548
Short-term Investments \| Commercial Paper [Member] \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	2,711	4,036
Short-term Investments \| Certificates of deposit and time deposits \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,479	1,274
Short-term Investments \| U.S. government securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	23	28
Short-term Investments \| Corporate notes and bonds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 28	$ 210

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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