Fair Value Measurements - Schedule of Pension Plan Assets at Fair Value by Level (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	$ 2,833	$ 2,539
Total investments in the fair value hierarchy	1,764	1,616
Investments measured at net asset value	1,069	923
Equity
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	2,060	1,806
Common Stock
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,022	940
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	729	665
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	14	12
Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	2	1
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	537	497
Government Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	169	141
Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	9	14
Derivatives and other
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	11	11
Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,038	953
Total investments in the fair value hierarchy	1,038	953
Level 1 | Common Stock
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,022	940
Level 1 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	14	12
Level 1 | Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	2	1
Level 1 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 | Government Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 1 | Derivatives and other
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	726	663
Total investments in the fair value hierarchy	726	663
Level 2 | Common Stock
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 | Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 2 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	537	497
Level 2 | Government Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	169	141
Level 2 | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	9	14
Level 2 | Derivatives and other
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	11	11
Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Total investments in the fair value hierarchy	0	0
Level 3 | Common Stock
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 | Cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 | Government Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	0	0
Level 3 | Derivatives and other
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	$ 0	$ 0