Financial Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($) $ in Millions		Mar. 29, 2020	Dec. 31, 2019
Long-term investments [Member]
Derivative [Line Items]
Carrying Amount of Actively Hedged Assets	[1]	$ 45	$ 45
Cumulative Amount of Fair Value Hedging Adjustment Increase/(Decrease) to Carrying Amount, Active Hedging Relationships, Asset		0	0
Cumulative Amount of Fair Value Hedging Adjustment Increase/(Decrease) to Carrying Amount, Discontinued Hedging Relationships, Asset		0	0
Long-term debt [Member]
Derivative [Line Items]
Carrying Amount of Actively Hedged Liabilities	[1]	2,027	7,092
Cumulative Amount of Fair Value Hedging Adjustment Increase/(Decrease) to Carrying Amount, Active Hedging Relationships, Liability		134	266
Cumulative Amount of Fair Value Hedging Adjustment Increase/(Decrease) to Carrying Amount, Discontinued Hedging Relationships, Liability		$ 1,196	$ 690

[1] Carrying amounts exclude the cumulative amount of fair value hedging adjustments.