Financing Agreements - Long-term Debt (Details) - USD ($)
$ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
Apr. 04, 2017 |
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Principal |
|
$ 1,805
|
|
$ 1,804
|
|
|
| Debt issuance costs |
|
(21)
|
|
(22)
|
|
|
| Long-term Debt and Capital Lease Obligations, Including Current Maturities |
|
1,784
|
|
1,782
|
|
|
| Less: Current portion of long-term debt |
|
29
|
|
23
|
|
|
| Long-term debt, less debt issuance costs of $21 in 2018 and $22 in 2017 |
|
$ 1,755
|
|
$ 1,759
|
|
|
| Senior Notes Due September 2023 [Member] |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Interest rate |
|
6.00%
|
|
6.00%
|
|
|
| Principal |
|
$ 300
|
|
$ 300
|
|
|
| Senior Notes Due December 2024 [Member] |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Interest rate |
|
5.50%
|
|
5.50%
|
|
|
| Principal |
|
$ 425
|
|
$ 425
|
|
|
| Senior Notes Due April 2025 [Member] |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Interest rate |
|
5.75%
|
[1] |
5.75%
|
[1] |
5.75%
|
| Principal |
|
$ 400
|
|
$ 400
|
|
|
| Senior Notes Due April 2025 [Member] | Cash Flow Hedging [Member] |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Interest rate |
|
5.75%
|
|
|
|
|
| Derivative, fixed interest rate |
|
3.85%
|
|
|
|
|
| Senior Notes Due June 2026 [Member] |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Interest rate |
[1] |
6.50%
|
|
6.50%
|
|
|
| Principal |
|
$ 375
|
|
$ 375
|
|
|
| Senior Notes Due June 2026 [Member] | Cash Flow Hedging [Member] |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Interest rate |
|
6.50%
|
|
|
|
|
| Derivative, fixed interest rate |
|
5.14%
|
|
|
|
|
| Term Facility [Member] |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Principal |
|
$ 275
|
|
275
|
|
|
| Other indebtedness [Member] |
|
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
|
| Principal |
|
$ 30
|
|
$ 29
|
|
|
|
|