Supplemental Financial Information - Accumulated other comprehensive income (loss) (Details) $ in Millions	9 Months Ended
	Oct. 01, 2023 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 7,740
Other comprehensive income (loss) before reclassifications	(50)
Amounts reclassified out of accumulated other comprehensive income (loss)	10
Other comprehensive income (loss)	4
Other comprehensive income (loss)	(36)
Ending balance	8,798
Currency  translation differences
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	135
Other comprehensive income (loss) before reclassifications	(24)
Amounts reclassified out of accumulated other comprehensive income (loss)	0
Other comprehensive income (loss)	0
Other comprehensive income (loss)	(24)
Ending balance	111
Change in fair  value cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1)
Other comprehensive income (loss) before reclassifications	(26)
Amounts reclassified out of accumulated other comprehensive income (loss)	10
Other comprehensive income (loss)	4
Other comprehensive income (loss)	(12)
Ending balance	(13)
Net actuarial gain/(losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(58)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified out of accumulated other comprehensive income (loss)	0
Other comprehensive income (loss)	0
Other comprehensive income (loss)	0
Ending balance	58
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	76
Ending balance	$ 40