Long-Term Debt and Credit Facilities - Components of Long-term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total Debt	$ 6,566	$ 6,520
Less: Current portion of long-term debt	0	0
Total debt, Excluding current portion of long-term debt	6,566	6,520
Short-term borrowings	$ 11	$ 13
Weighted-average interest rate on short term borrowings	2.80%	1.60%
Scheduled maturities of long-term debt [Abstract]
2018	$ 0
2019	1,097
2020	248
2021	298
2022	889
Thereafter	$ 3,311
Notes
Debt Instrument [Line Items]
Weighted average interest rate	2.00%
Maturity date range, start	Dec. 31, 2018
Maturity date range, end	Dec. 31, 2078
Total Debt	$ 6,542	$ 6,225
Commercial paper
Debt Instrument [Line Items]
Weighted average interest rate	1.50%
Maturity date	2018
Total Debt	$ 24	$ 295

Year when the debt instrument is scheduled to be fully repaid.

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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Weighted average interest rate of debt outstanding.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of borrowings from a bank classified as other, maturing within one year or operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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