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Debt - Debt (Details) - USD ($)		3 Months Ended		6 Months Ended
	Mar. 29, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jul. 19, 2018	Jun. 15, 2018	Mar. 15, 2018
Debt Instruments [Line Items]
Long-term Debt, Gross								$ 500,000,000
Proceeds from Debt, Net of Issuance Costs				$ 490,000,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed				100.00%
Debt Instrument, Interest Rate, Increase (Decrease)				2500.00%
Gain (Loss) on Extinguishment of Debt		$ (6,000,000)	$ 0	$ (6,000,000)	$ 0
Line of Credit Facility, Covenant Terms - Monetary	$ 9,000,000,000
Letters of Credit, Maximum Borrowing Capacity		100,000,000		100,000,000
Letters of Credit Outstanding, Amount		3		3
Commercial Paper, Outstanding		0		0
Previously Reported
Debt Instruments [Line Items]
Line of Credit Facility, Covenant Terms - Monetary				13,500,000,000
Letters of Credit, Maximum Borrowing Capacity		250,000,000		250,000,000
Revolving Credit Facility
Debt Instruments [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		750,000,000		$ 750,000,000
Line of Credit Facility, Covenant Terms - Percent				35.00%
Line of Credit Facility, Maximum Amount Outstanding During Period				$ 0
Revolving Credit Facility | Previously Reported
Debt Instruments [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,000,000,000		1,000,000,000
Commercial Paper [Member]
Debt Instruments [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,000,000,000		$ 1,000,000,000
4.4% Notes, due 2048
Debt Instruments [Line Items]
Interest rate								4.40%
6.3% Notes, due 2018 | Senior Notes
Debt Instruments [Line Items]
Interest rate								6.30%
Repayment of debt								$ 320,000,000
8.125% Notes, due 2068
Debt Instruments [Line Items]
Interest rate							8.125%
Debt Instrument, Face Amount							$ 500,000,000
3 month Libor 2.125% Notes due 2067 | LIBOR
Debt Instruments [Line Items]
Variable Interest Rate				2.125%
Subsequent Event [Member] | Commercial Paper [Member]
Debt Instruments [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 750

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- Definition

Letters of Credit, Maximum Borrowing Capacity

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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.

+ References

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of principal amount of debt redeemed.

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Fair value amount of debt instrument that was repurchased.

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

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum amount borrowed under the credit facility at any time during the period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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