Long-Term Debt (Components of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 13,042	$ 13,894
Less current portion of long-term debt	1,144	864
Long-term debt excluding current portion	11,898	13,030
Notes 2.625% To 10.20% Due Through 2046 [Member] \| Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 13,000	$ 13,852
Notes 2.625% To 10.20% Due Through 2046 [Member] \| Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated interest rate	2.625%
Notes 2.625% To 10.20% Due Through 2046 [Member] \| Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Stated interest rate	10.20%
Notes 2.625% To 10.20% Due Through 2046 [Member] \| Notes [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.60%	4.90%
Debenture, 7.75% interest payable semi-annually, due 2027 [Member] \| Debenture [Member]
Debt Instrument [Line Items]
Long-term debt	$ 42	$ 42
Stated interest rate	7.75%

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

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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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