Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets:
Cash and cash equivalents	$ 1,381	$ 1,339
Foreign currency exchange forward contracts	17	25
Total	4,138	4,077
Liabilities:
Deferred compensation arrangements	74	72
Contingent consideration	47	59
Foreign currency exchange forward contracts	6	2
Total	127	133
Available-for-sale marketable securities
Assets:
Total available-for-sale marketable securities	2,666	2,641
Available-for-sale marketable securities | Corporate and asset-backed debt securities
Assets:
Total available-for-sale marketable securities	1,172	1,177
Available-for-sale marketable securities | Foreign government debt securities
Assets:
Total available-for-sale marketable securities	828	845
Available-for-sale marketable securities | United States agency debt securities
Assets:
Total available-for-sale marketable securities	124	211
Available-for-sale marketable securities | United States treasury debt securities
Assets:
Total available-for-sale marketable securities	487	350
Available-for-sale marketable securities | Certificates of deposit
Assets:
Total available-for-sale marketable securities	51	53
Available-for-sale marketable securities | Other
Assets:
Total available-for-sale marketable securities	4	5
Trading marketable securities
Assets:
Total available-for-sale marketable securities	74	72
Level 1
Assets:
Cash and cash equivalents	1,381	1,339
Total	1,455	1,411
Liabilities:
Deferred compensation arrangements	74	72
Total	74	72
Level 1 | Trading marketable securities
Assets:
Total available-for-sale marketable securities	74	72
Level 2
Assets:
Foreign currency exchange forward contracts	17	25
Total	2,683	2,666
Liabilities:
Foreign currency exchange forward contracts	6	2
Total	6	2
Level 2 | Available-for-sale marketable securities
Assets:
Total available-for-sale marketable securities	2,666	2,641
Level 2 | Available-for-sale marketable securities | Corporate and asset-backed debt securities
Assets:
Total available-for-sale marketable securities	1,172	1,177
Level 2 | Available-for-sale marketable securities | Foreign government debt securities
Assets:
Total available-for-sale marketable securities	828	845
Level 2 | Available-for-sale marketable securities | United States agency debt securities
Assets:
Total available-for-sale marketable securities	124	211
Level 2 | Available-for-sale marketable securities | United States treasury debt securities
Assets:
Total available-for-sale marketable securities	487	350
Level 2 | Available-for-sale marketable securities | Certificates of deposit
Assets:
Total available-for-sale marketable securities	51	53
Level 2 | Available-for-sale marketable securities | Other
Assets:
Total available-for-sale marketable securities	4	5
Level 3
Liabilities:
Contingent consideration	47	59
Total	$ 47	$ 59