Accumulated Other Comprehensive (Loss) Income (AOCI), Summary of AOCI Balances Including Amounts Reclassified from AOCI into Net Income (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 5,083
Other comprehensive (loss) income before reclassifications, net of tax	(53)	$ 128
Amounts reclassified from AOCI, net of tax	41	25
Net current period other comprehensive (loss) income	(12)	153
Ending Balance	5,642
Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(691)	(726)
Ending Balance	(703)	(573)
Foreign Currency Translation [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(54)	(178)
Other comprehensive (loss) income before reclassifications, net of tax	(42)	120
Amounts reclassified from AOCI, net of tax	0	0
Net current period other comprehensive (loss) income	(42)	120
Ending Balance	(96)	(58)
Unrealized Gains (Losses) on Hedging Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	9	6
Other comprehensive (loss) income before reclassifications, net of tax	(11)	8
Amounts reclassified from AOCI, net of tax	2	(2)
Net current period other comprehensive (loss) income	(9)	6
Ending Balance	0	12
Unrecognized (Losses) Gains and Prior Service Cost, Net [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(646)	(554)
Other comprehensive (loss) income before reclassifications, net of tax	0	0
Amounts reclassified from AOCI, net of tax	39	27
Net current period other comprehensive (loss) income	39	27
Ending Balance	$ (607)	$ (527)