Fair Value Measurements and Derivatives - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
| Marketable securities |
$ 41
|
$ 40
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
| Marketable securities |
5
|
5
|
| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
| Marketable securities |
36
|
35
|
| Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member] | Accounts Receivable Other [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
| Currency contracts asset value |
|
1
|
| Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member] | Other Accrued Liabilities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
| Currency contracts liability value |
2
|
3
|
| Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] | Fair Value, Inputs, Level 2 [Member] | Accounts Receivable Other [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
| Currency contracts asset value |
7
|
1
|
| Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] | Fair Value, Inputs, Level 2 [Member] | Other Accrued Liabilities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
| Currency contracts liability value |
1
|
5
|
| Fair Value, Measurements, Recurring [Member] | Currency Swap [Member] | Cash Flow Hedging [Member] | Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Liabilities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
| Currency contracts liability value |
$ 227
|
$ 177
|