Retirement Plans and Other Benefits (Narrative) (Details) - USD ($)	11 Months Ended	12 Months Ended
	Dec. 31, 2017	Feb. 01, 2020	Dec. 31, 2019	Feb. 02, 2019	Dec. 31, 2018	Feb. 03, 2018
Defined Benefit Plan Disclosure [Line Items]
Accumulated projected benefit obligation				$ 696,000,000		$ 22,000,000
Future increases in medical plan costs to be incurred by retirees				100.00%
SERP Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated projected benefit obligation				$ 10,000,000
Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent of match				25.00%
Employer's matching vesting period				5 years
Employer's matching contribution				$ 4,000,000		3,000,000
Eligible age to qualified savings plans	21 years
Eligible service to qualified savings plans	1 year				28 days
Minimum eligible service hours to qualified savings plans	1000 hours
Defined Contribution Plan Employer Matching Contribution Period Of Service					1 year
Defined Contribution Plan Employer Matching Contribution Minimum Number of Working Hours Required					1000 hours
Defined Contribution Maximum Percentage of Compensation Matched By Company				4.00%
U.S. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer's contribution				$ 55,000,000
U.S. Plan [Member] | Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount			$ 19,000
Puerto Rico Plan [Member] | Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount			$ 15,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated projected benefit obligation				12,000,000
Pension benefits paid				165,000,000		53,000,000
Pension Benefits [Member] | U.S. Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer's contribution				128,000,000
Market-related value of plan assets				615,000,000		585,000,000
Pension Benefits [Member] | U.S. Plan [Member] | Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension benefits paid				$ 3,000,000
Pension Benefits [Member] | Scenario, Forecast [Member] | U.S. Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer's contribution		$ 55,000,000
Pension Benefits [Member] | Equity investments | U.S. Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Target composition of plan assets				36.50%
Pension Benefits [Member] | Equity investments | CANADA | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Target composition of plan assets				5.00%
Pension Benefits [Member] | Fixed Income Securities | U.S. Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Target composition of plan assets				60.00%
Pension Benefits [Member] | Fixed Income Securities | CANADA | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Target composition of plan assets				95.00%
Pension Benefits [Member] | Real Estate Investment Trust | U.S. Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Target composition of plan assets				3.50%
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension benefits paid				$ 2,000,000		$ 2,000,000
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Market-related value of plan assets, Period for calculation				3 years
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Market-related value of plan assets, Period for calculation				5 years
Maximum [Member] | Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent			40.00%