Income Taxes, Narrative (Details) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Income Tax Narrative (Textual)
Increase in valuation allowance	$ 89
Cumulative undistributed earnings of international subsidiaries	4,200
Liability for unrecognized tax benefits due to uncertainties with respect to sustaining refund claims	954	$ 721		$ 721
Tax refund receivable recorded in connection with refund claims	525	343		343
Income tax benefits if recognized that would reduce the effective tax rate	$ 762	$ 807		807
Applicable statutory income tax rate (percent)	19.20%	19.60%	29.80%
Income tax benefit resulting from effect of tax reform adjustments, including components for which we recorded a provisional amount and components that were incomplete			$ 1,862
Income tax benefit and reduction to net deferred tax liabilities			2,643	2,643
Tax on the deemed repatriation of the accumulated earnings and profits of our international subsidiaries			734
Cumulative undistributed earnings and profits of international subsidiaries			4,700
Recognition of foreign withholding tax, net of U.S. federal tax benefit			$ 47	47
U.S. [Member]
Income Tax Narrative (Textual)
Applicable statutory income tax rate (percent)	21.00%	21.00%	35.00%
U.S. [Member]
Income Tax Narrative (Textual)
Applicable statutory income tax rate (percent)	21.00%	21.00%	35.00%
Income tax benefit and reduction to net deferred tax liabilities		$ (9)	$ 2,600
U.S. [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Narrative (Textual)
Refund received, including interest, associated with income tax audit	$ 348
Tax Year 2005 through Tax Year 2009 [Member]
Income Tax Narrative (Textual)
Tax refund receivable recorded in connection with refund claims	525
Other Long-term Liabilities [Member]
Income Tax Narrative (Textual)
Liability for unrecognized tax benefits due to uncertainties with respect to sustaining refund claims	954	$ 721		$ 721
Other Long-term Liabilities [Member] | Tax Year 2005 through Tax Year 2009 [Member]
Income Tax Narrative (Textual)
Liability for unrecognized tax benefits due to uncertainties with respect to sustaining refund claims	$ 525