Debt - Exchange (Details) $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($)
Debt Conversion [Line Items]
Principal Amount Exchanged	$ 600
4.07% Senior Notes Due March 2022	300
Cash Consideration	$ 322
Debt Exchange, New Senior Notes Coupon	4.07%
Debt Exchange, Conversion Premium	$ 22
Debt Exchange, New Senior Notes, Maturity Date	March 2022
Loss on Extinguishment of Debt Exchanged for Cash	$ 9
Debt Exchange, Exchange Premium and Other Carrying Value Adjustments on Old Notes	9
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction	$ 4
4.07% Senior Notes due March 17, 2022 [Member]
Debt Conversion [Line Items]
Debt Conversion, Converted Instrument, Issuance Date, Month and Year	March 2017
4.07% Senior Notes Due March 2022	$ 300
Senior Notes due May 2018 [Member]
Debt Conversion [Line Items]
Coupon	6.35%
Principal Amount Exchanged	$ 260
4.07% Senior Notes Due March 2022	130
Cash Consideration	$ 143
Senior Notes due March 2019 [Member]
Debt Conversion [Line Items]
Coupon	2.75%
Principal Amount Exchanged	$ 94
4.07% Senior Notes Due March 2022	47
Cash Consideration	$ 48
Senior Notes due December 2019 [Member]
Debt Conversion [Line Items]
Coupon	5.625%
Principal Amount Exchanged	$ 96
4.07% Senior Notes Due March 2022	48
Cash Consideration	$ 56
Senior Notes due May 2020 [Member]
Debt Conversion [Line Items]
Coupon	2.80%
Principal Amount Exchanged	$ 87
4.07% Senior Notes Due March 2022	44
Cash Consideration	$ 43
Senior Notes due August 2020 [Member]
Debt Conversion [Line Items]
Coupon	3.50%
Principal Amount Exchanged	$ 38
4.07% Senior Notes Due March 2022	19
Cash Consideration	$ 20
Senior Notes due September 2020 [Member]
Debt Conversion [Line Items]
Coupon	2.75%
Principal Amount Exchanged	$ 25
4.07% Senior Notes Due March 2022	12
Cash Consideration	$ 12

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The rate of interest that was being paid on the original debt issue that is being converted in the noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The amount of debt issuance costs that were incurred during a noncash or partial noncash transaction.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Debt Conversion Premium

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Debt Exchange, Cash Consideration Paid

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Debt Exchange, Exchange Premium and Other Carrying Value Adjustments on Old Notes

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