Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Debt and Lines of Credit - Additional Information (Details) - USD ($)		1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 03, 2015	May. 31, 2015	Apr. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Commercial paper				$ 0		$ 0
Long-term debt, gross				4,875,000,000		4,875,000,000		$ 4,625,000,000
Proceeds from issuance of long-term debt						498,000,000	$ 498,000,000
Interest and debt expense				24,000,000	$ 24,000,000	46,000,000	$ 49,000,000
Notes payable
Debt Instrument [Line Items]
Long-term debt, gross		$ 500,000,000
Payments of debt issuance costs		3,000,000
Proceeds from issuance of long-term debt		$ 498,000,000
Retirement of long-term debt			$ 250,000,000
Subsequent event \| Notes payable
Debt Instrument [Line Items]
Retirement of long-term debt	$ 750,000,000
Consortium of investment-grade banks \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity until March 2020				$ 2,000,000,000		$ 2,000,000,000