Financial Instruments - Long-Term Debt (Details) - USD ($) $ in Millions		Mar. 29, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Net fair value adjustments related to hedging and purchase accounting		$ 3	$ 5
Net unamortized discounts, premiums and debt issuance costs		(38)	(43)
Total long-term debt, carried at historical proceeds, as adjusted	[1]	36,281	35,955
Current portion of long-term debt, carried at historical proceeds, as adjusted (not included above)	[1]	337	1,462
Unsecured Debt [Member]
Debt Instrument [Line Items]
Total long-term debt, principal amount		34,778	34,820
Net fair value adjustments related to hedging and purchase accounting		1,671	1,305
Net unamortized discounts, premiums and debt issuance costs		(173)	(176)
Other long-term debt		5	5
Total long-term debt, carried at historical proceeds, as adjusted		36,281	35,955
Current portion of long-term debt, carried at historical proceeds, as adjusted (not included above)		$ 337	$ 1,462

[1] Amounts may not add due to rounding.