Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets:
Cash and cash equivalents	$ 1,110	$ 1,395
Foreign currency exchange contracts	2	3
Total	5,207	4,345
Liabilities:
Deferred compensation arrangements	67	57
Contingent consideration	59	103
Foreign currency exchange contracts	1	1
Total	127	161
Available-for-sale marketable securities
Assets:
Marketable securities	4,028	2,890
Available-for-sale marketable securities | Corporate and asset-backed debt securities
Assets:
Marketable securities	1,841	1,280
Available-for-sale marketable securities | Foreign government debt securities
Assets:
Marketable securities	890	848
Available-for-sale marketable securities | United States agency debt securities
Assets:
Marketable securities	519	288
Available-for-sale marketable securities | United States treasury debt securities
Assets:
Marketable securities	635	343
Available-for-sale marketable securities | Certificates of deposit
Assets:
Marketable securities	115	114
Available-for-sale marketable securities | Other
Assets:
Marketable securities	28	17
Trading marketable securities
Assets:
Marketable securities	67	57
Level 1
Assets:
Cash and cash equivalents	1,110	1,395
Total	1,177	1,452
Liabilities:
Deferred compensation arrangements	67	57
Total	67	57
Level 1 | Trading marketable securities
Assets:
Marketable securities	67	57
Level 2
Assets:
Foreign currency exchange contracts	2	3
Total	4,030	2,893
Liabilities:
Foreign currency exchange contracts	1	1
Total	1	1
Level 2 | Available-for-sale marketable securities
Assets:
Marketable securities	4,028	2,890
Level 2 | Available-for-sale marketable securities | Corporate and asset-backed debt securities
Assets:
Marketable securities	1,841	1,280
Level 2 | Available-for-sale marketable securities | Foreign government debt securities
Assets:
Marketable securities	890	848
Level 2 | Available-for-sale marketable securities | United States agency debt securities
Assets:
Marketable securities	519	288
Level 2 | Available-for-sale marketable securities | United States treasury debt securities
Assets:
Marketable securities	635	343
Level 2 | Available-for-sale marketable securities | Certificates of deposit
Assets:
Marketable securities	115	114
Level 2 | Available-for-sale marketable securities | Other
Assets:
Marketable securities	28	17
Level 3
Liabilities:
Contingent consideration	59	103
Total	$ 59	$ 103