Long-Term Debt (Schedule of Maturities of Long-Term Debt) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Long-term Debt, Fiscal Year Maturity
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 204
Long-term Debt, Maturities, Repayments of Principal in Year Two	133
Long-term Debt, Maturities, Repayments of Principal in Year Three	2,630
Long-term Debt, Maturities, Repayments of Principal in Year Four	2,639
Long-term Debt, Maturities, Repayments of Principal in Year Five	5,580
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,574
Total maturities	13,760
Less: Deferred debt issuance costs	(171)
Plus unamortized note premium	7
Long-term Debt, Total	13,596
Term Loans and Outstanding Revolving Credit Loans [Member]
Long-term Debt, Fiscal Year Maturity
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,622
Total maturities	1,622
Less: Deferred debt issuance costs	(21)
Long-term Debt, Total	$ 1,601

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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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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