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Supplemental Disclosures of Cash Flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Disclosures of Cash Flow Data [Abstract]
Interest paid	$ 281	$ 248	$ 274
Income taxes paid (received)	90	$ 170	$ 197
Significant non-cash investing and financing transactions:
Investments received in financing transactions	$ 263

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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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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Amount of assets, classified as other, acquired in a noncash or part noncash acquisition.

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