Income Taxes (Schedule Of Reconciliation Of U.S. Federal Statutory Tax Rate To Our Effective Income Tax Rate) (Details) - USD ($)		3 Months Ended		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount				$ (474,000,000)	$ 2,437,000,000	$ 3,537,000,000
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount				(382,000,000)	(207,000,000)	(162,000,000)
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount		$ 371,000,000		371,000,000	412,000,000
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount				(229,000,000)	(549,000,000)
Effective Tax Rate Reconciliation, Nondeductible Expenses, Share-based Payments, Amount				(180,000,000)	(181,000,000)	(207,000,000)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount				66,000,000	91,000,000	26,000,000
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount				(53,000,000)	(48,000,000)	(68,000,000)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount				43,000,000	40,000,000	(95,000,000)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount				(43,000,000)	84,000,000	17,000,000
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount					(111,000,000)	(1,271,000,000)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount	[1]					(128,000,000)
Total income tax (benefit)/expense				$ (1,623,000,000)	$ 1,144,000,000	$ 1,649,000,000
Effective Income Tax Rate Reconciliation, U.S. Federal Statutory Tax, Percent				21.00%	21.00%	35.00%
Effective Tax Rate Reconciliation, Tax Credit, Research, Percent				16.90%	(1.80%)	(1.60%)
Effective Tax Rate Reconciliation, Tax Settlement, Percent	[2]			16.40%	(3.60%)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Percent	[3]			0.101	(0.047)
Effective Tax Rate Reconciliation, Nondeductible Expenses, Share-based Payments, Percent	[4]			8.00%	(1.60%)	(2.10%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent				(3.00%)	1.00%	0.30%
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent				2.40%	(0.40%)	(0.70%)
Effective Income Tax Reconciliation, Non-US Activities, Percent				(1.90%)	0.30%	(0.90%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent				1.90%	0.70%	0.20%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent					(0.010)	(0.126)
EffectiveIncome Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent						(1.30%)
Effective income tax rate				71.80%	9.90%	16.30%
Tax Year 2013-2014 [Member]
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount					$ 412,000,000
Reduction in Taxes [Member]
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, Impact Of Tax Reform Legislation, Amount			$ 1,430,000,000
Foreign Tax Authority [Member] | Reduction in Taxes [Member]
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, Impact Of Tax Reform Legislation, Amount					$ (159,000,000)

[1] ⁽⁴⁾  In accordance with U.S. Securities and Exchange Commission Staff Accounting Bulletin No. 118 (SAB 118), in the fourth quarter of 2017, we recorded provisional tax benefits of $1,430 related to the remeasurement of our net U.S. deferred tax liabilities to reflect the reduction in the corporate tax rate and a provisional tax expense of $159 related to tax on non-U.S. activities resulting from the TCJA. During the fourth quarter of 2018 and in accordance with SAB 118, the Company completed its accounting for the provisional amounts recognized at December 31, 2017 and recorded an incremental benefit related to refinements to these provisional amounts which was not significant.

[2] ⁽²⁾  On December 22, 2017, the Tax Cuts and Jobs Act (TCJA) was enacted. The TCJA revised the U.S. corporate income tax by, among other things, lowering the rate from 35% to 21% effective January 1, 2018, implementing a territorial tax system and imposing a one-time tax on deemed repatriated earnings of non-U.S. subsidiaries. The TCJA also enacted provisions which effectively apply a lower U.S. tax rate to intangible income derived from serving non-U.S. markets. In 2019 and 2018, we recorded tax benefits related to foreign derived intangible income of $229 and $549.

[3] ⁽¹⁾  In the fourth quarter of 2019, we recorded a tax benefit of $371 related to the settlement of state tax audits spanning 15 tax years. In the third quarter of 2018, we recorded a tax benefit of $412 related to the settlement of the 2013-2014 federal tax audit.

[4] ⁽³⁾  In 2019, 2018 and 2017, we recorded excess tax benefits related to employee share-based payments of $180, $181 and $207, respectively.