Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Cash Flows (Unaudited) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Apr. 01, 2018
Condensed Financial Statements [Line Items]
Net cash used by operating activities	[1]	$ (795)	$ (496)
Cash flows from investing activities:
Capital expenditures		(181)	(104)
Other, net		(6)	(1)
Net cash used by investing activities		(187)	(105)
Cash flows from financing activities:
Proceeds from commercial paper, net		1,010	2,494
Dividends paid		(268)	(250)
Purchases of common stock		(133)	(267)
Other, net		88	(25)
Net cash provided by financing activities		697	1,952
Net cash used by discontinued operations		(5)	(2)
Cash sweep/funding by parent		0	0
Net increase in cash and equivalents		(290)	1,349
Cash and equivalents at beginning of period		963	2,983
Cash and equivalents at end of period		673	4,332
Consolidating Adjustments
Condensed Financial Statements [Line Items]
Net cash used by operating activities	[1]	0	0
Cash flows from investing activities:
Capital expenditures		0	0
Other, net		0	0
Net cash used by investing activities		0	0
Cash flows from financing activities:
Proceeds from commercial paper, net		0	0
Dividends paid		0	0
Purchases of common stock		0	0
Other, net		0	0
Net cash provided by financing activities		0	0
Net cash used by discontinued operations		0	0
Cash sweep/funding by parent		0	0
Net increase in cash and equivalents		0	0
Cash and equivalents at beginning of period		0	0
Cash and equivalents at end of period		0	0
Parent Company
Condensed Financial Statements [Line Items]
Net cash used by operating activities	[1]	59	80
Cash flows from investing activities:
Capital expenditures		(20)	(7)
Other, net		5	1
Net cash used by investing activities		(15)	(6)
Cash flows from financing activities:
Proceeds from commercial paper, net		1,010	2,494
Dividends paid		(268)	(250)
Purchases of common stock		(133)	(267)
Other, net		(5)	(25)
Net cash provided by financing activities		604	1,952
Net cash used by discontinued operations		(5)	(2)
Cash sweep/funding by parent		(774)	(167)
Net increase in cash and equivalents		(131)	1,857
Cash and equivalents at beginning of period		460	1,930
Cash and equivalents at end of period		329	3,787
Guarantor Subsidiaries
Condensed Financial Statements [Line Items]
Net cash used by operating activities	[1]	(167)	105
Cash flows from investing activities:
Capital expenditures		(106)	(86)
Other, net		1	(2)
Net cash used by investing activities		(105)	(88)
Cash flows from financing activities:
Proceeds from commercial paper, net		0	0
Dividends paid		0	0
Purchases of common stock		0	0
Other, net		0	0
Net cash provided by financing activities		0	0
Net cash used by discontinued operations		0	0
Cash sweep/funding by parent		272	(17)
Net increase in cash and equivalents		0	0
Cash and equivalents at beginning of period		0	0
Cash and equivalents at end of period		0	0
Non-Guarantor Subsidiaries
Condensed Financial Statements [Line Items]
Net cash used by operating activities	[1]	(687)	(681)
Cash flows from investing activities:
Capital expenditures		(55)	(11)
Other, net		(12)	0
Net cash used by investing activities		(67)	(11)
Cash flows from financing activities:
Proceeds from commercial paper, net		0	0
Dividends paid		0	0
Purchases of common stock		0	0
Other, net		93	0
Net cash provided by financing activities		93	0
Net cash used by discontinued operations		0	0
Cash sweep/funding by parent		502	184
Net increase in cash and equivalents		(159)	(508)
Cash and equivalents at beginning of period		503	1,053
Cash and equivalents at end of period		$ 344	$ 545

[1] * Continuing operations only