Fair Value Measurements (Financial Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | | |
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 |
Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Equity securities | $ 26 | | $ 26 | |
Long-term investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments | 389 | | 397 | |
Level 3 [Member] | Contingent Consideration | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | 36 | $ 57 | 35 | $ 54 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances | 1 | 8 | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings | 3 | (3) | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | (3) | $ (2) | | |
Recurring [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Equity securities | | | 26 | |
Recurring [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Equity securities | 26 | | | |
Recurring [Member] | Other Current Assets [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Derivative financial instruments, assets | 37 | | 54 | |
Recurring [Member] | Accrued Expenses And Other Current Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | (11) | | | |
Derivative financial instruments, liabilities | (4) | | | |
Recurring [Member] | Other Noncurrent Assets [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Derivative financial instruments, assets | 11 | | 15 | |
Recurring [Member] | Other Noncurrent Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | (25) | | (21) | |
Derivative financial instruments, liabilities | (1) | | | |
Recurring [Member] | Long-term investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments | 389 | | 397 | |
Recurring [Member] | Other Current Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | | | (14) | |
Derivative financial instruments, liabilities | | | (7) | |
Recurring [Member] | Money Market Funds [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Money market funds | 735 | | 507 | |
Recurring [Member] | Commercial Paper [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Money market funds | 254 | | 266 | |
Recurring [Member] | Time Deposits | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Money market funds | 5 | | 4 | |
Recurring [Member] | Level 1 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Equity securities | 26 | | 26 | |
Recurring [Member] | Level 1 [Member] | Other Current Assets [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Derivative financial instruments, assets | 0 | | 0 | |
Recurring [Member] | Level 1 [Member] | Accrued Expenses And Other Current Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | 0 | | | |
Derivative financial instruments, liabilities | 0 | | | |
Recurring [Member] | Level 1 [Member] | Other Noncurrent Assets [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Derivative financial instruments, assets | 0 | | 0 | |
Recurring [Member] | Level 1 [Member] | Other Noncurrent Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | 0 | | 0 | |
Derivative financial instruments, liabilities | 0 | | | |
Recurring [Member] | Level 1 [Member] | Other Current Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | | | 0 | |
Derivative financial instruments, liabilities | | | 0 | |
Recurring [Member] | Level 1 [Member] | Money Market Funds [Member] | Cash Equivalents [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Money market funds | 735 | | 507 | |
Recurring [Member] | Level 2 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Equity securities | 0 | | 0 | |
Recurring [Member] | Level 2 [Member] | Other Current Assets [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Derivative financial instruments, assets | 37 | | 54 | |
Recurring [Member] | Level 2 [Member] | Accrued Expenses And Other Current Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | 0 | | | |
Derivative financial instruments, liabilities | (4) | | | |
Recurring [Member] | Level 2 [Member] | Other Noncurrent Assets [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Derivative financial instruments, assets | 11 | | 15 | |
Recurring [Member] | Level 2 [Member] | Other Noncurrent Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | 0 | | 0 | |
Derivative financial instruments, liabilities | (1) | | | |
Recurring [Member] | Level 2 [Member] | Long-term investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Restricted investments | 389 | | 397 | |
Recurring [Member] | Level 2 [Member] | Other Current Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | | | 0 | |
Derivative financial instruments, liabilities | | | (7) | |
Recurring [Member] | Level 2 [Member] | Commercial Paper [Member] | Cash Equivalents [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Money market funds | 254 | | 266 | |
Recurring [Member] | Level 2 [Member] | Time Deposits | Cash Equivalents [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Money market funds | 5 | | 4 | |
Recurring [Member] | Level 3 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Equity securities | 0 | | 0 | |
Recurring [Member] | Level 3 [Member] | Other Current Assets [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Derivative financial instruments, assets | 0 | | 0 | |
Recurring [Member] | Level 3 [Member] | Accrued Expenses And Other Current Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | (11) | | | |
Derivative financial instruments, liabilities | 0 | | | |
Recurring [Member] | Level 3 [Member] | Other Noncurrent Assets [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Derivative financial instruments, assets | 0 | | 0 | |
Recurring [Member] | Level 3 [Member] | Other Noncurrent Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | (25) | | (21) | |
Derivative financial instruments, liabilities | 0 | | | |
Recurring [Member] | Level 3 [Member] | Other Current Liabilities [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Contingent consideration liabilities | | | (14) | |
Derivative financial instruments, liabilities | | | 0 | |
Time Deposits | Recurring [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Short term investments | 3 | | 554 | |
Time Deposits | Recurring [Member] | Level 1 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Short term investments | 0 | | 0 | |
Time Deposits | Recurring [Member] | Level 2 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Short term investments | 3 | | 554 | |
Time Deposits | Recurring [Member] | Level 3 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Short term investments | 0 | | 0 | |
Certificates of deposit and commercial paper | Recurring [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Available-for-sale securities, current | 65 | | | |
Certificates of deposit and commercial paper | Recurring [Member] | Level 1 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Available-for-sale securities, current | 0 | | | |
Certificates of deposit and commercial paper | Recurring [Member] | Level 2 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Available-for-sale securities, current | 65 | | | |
Certificates of deposit and commercial paper | Recurring [Member] | Level 3 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Available-for-sale securities, current | $ 0 | | | |
Commercial Paper [Member] | Recurring [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Available-for-sale securities, current | | | 310 | |
Commercial Paper [Member] | Recurring [Member] | Level 1 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Available-for-sale securities, current | | | 0 | |
Commercial Paper [Member] | Recurring [Member] | Level 2 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Available-for-sale securities, current | | | 310 | |
Commercial Paper [Member] | Recurring [Member] | Level 3 [Member] | Short-term Investments [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Available-for-sale securities, current | | | $ 0 | |