Financial Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) $ in Millions	Apr. 01, 2018 USD ($)
Short-term investments [Member]
Derivative [Line Items]
Carrying amount of hedged assets	$ 286
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Assets	(1)
Long-term investments [Member]
Derivative [Line Items]
Carrying amount of hedged assets	45
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Assets	(1)
Short-term borrowings, including current portion of long-term debt [Member]
Derivative [Line Items]
Carrying amount of hedged liabilities	999
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Liabilities	1
Long-term debt [Member]
Derivative [Line Items]
Carrying amount of hedged liabilities	11,372
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Liabilities	$ 100