Commercial Paper and Long-term Debt (Narrative) (Details)
|
3 Months Ended |
12 Months Ended |
|
|
Jul. 02, 2017
USD ($)
|
Dec. 31, 2018
USD ($)
lenders
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
Nov. 30, 2015
USD ($)
|
| Long-term Debt [Line Items] |
|
|
|
|
|
| Commercial paper |
|
$ 300,000,000
|
$ 300,000,000
|
|
|
| Commercial Paper, Weighted Average Interest Rate |
|
2.954%
|
1.583%
|
|
|
| Commercial Paper, Weighted Average Original Maturity Period |
|
16 days
|
20 days
|
|
|
| Commercial paper, maximum original maturity period |
|
90 days
|
|
|
|
| Repayments of Debt |
$ 591,000,000
|
|
|
|
|
| Loss on repayment of long-term debt |
39,000,000
|
$ 0
|
$ 39,000,000
|
$ 0
|
|
| Loss on repayment of long-term debt, net of tax |
$ 25,000,000
|
|
|
|
|
| Line of Credit Facility, Maximum Borrowing Capacity |
|
|
|
|
$ 1,250,000,000
|
| Debt Instrument, Basis Spread on Variable Rate |
|
0.805%
|
|
|
|
| Number of highly rated lenders | lenders |
|
20
|
|
|
|
| Aggregate Maximum Percentage Of Any Single Lender |
|
10.00%
|
|
|
|
| Borrowings outstanding on long-term line of credit |
|
$ 0
|
0
|
|
|
| Outstanding letters of credit |
|
0
|
0
|
|
|
| Line of Credit Facility, Remaining Borrowing Capacity |
|
$ 950,000,000
|
|
|
|
| Ratio of indebtedness to net capital |
|
0.306
|
|
|
|
| Total payments for interest on commercial paper and long-term debt |
|
$ 194,000,000
|
$ 214,000,000
|
$ 231,000,000
|
|
| Maximum [Member] |
|
|
|
|
|
| Long-term Debt [Line Items] |
|
|
|
|
|
| Ratio of indebtedness to net capital |
|
0.60
|
|
|
|