Supplemental Disclosures of Cash Flow (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of supplemental cash flow data [Abstract]
Interest paid	$ 272us-gaap_InterestPaidNet	$ 260us-gaap_InterestPaidNet	$ 270us-gaap_InterestPaidNet
Income taxes paid (received)	254us-gaap_IncomeTaxesPaidNet	10us-gaap_IncomeTaxesPaidNet	124us-gaap_IncomeTaxesPaidNet
Significant non-cash investing and financing transactions:
Value of stock received from stock options exercised through stock swap transactions	13	5
Other investments received in our repurchase program	152
Business dispositions:
Cash received			(1)
Gain (loss) on dispositions	$ 1		$ (1)

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The total value of stock received in a non-cash transaction from stock options exercised through stock swap transactions

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No definition available.

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Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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The amount of investments that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "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 cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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