Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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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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 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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Debt (Schedule Of Outstanding Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Debt Instrument [Line Items]
Current portion of long-term debt	$ 1,215	$ 314
Short-term debt	1,215	314
Long-term debt	11,956	5,824
Long-term debt, net	10,741	5,510
Senior notes – 2.35% due 2019
Debt Instrument [Line Items]
Long-term debt	$ 0	300
Interest rate	2.35%
Senior notes – 2.35% due 2020
Debt Instrument [Line Items]
Long-term debt	$ 500	499
Interest rate	2.35%
Senior notes – 3.50% due 2020
Debt Instrument [Line Items]
Long-term debt	$ 698	0
Interest rate	3.50%
Senior notes – 4.80% due 2021
Debt Instrument [Line Items]
Long-term debt	$ 499	499
Interest rate	4.80%
Senior notes – Floating rate due 2021
Debt Instrument [Line Items]
Long-term debt	$ 298	0
Senior notes – 2.75% due 2022
Debt Instrument [Line Items]
Long-term debt	$ 498	497
Interest rate	2.75%
Senior notes – 3.30% due 2023
Debt Instrument [Line Items]
Long-term debt	$ 349	348
Interest rate	3.30%
Senior notes – 4.05% due 2023
Debt Instrument [Line Items]
Long-term debt	$ 249	249
Interest rate	4.05%
Senior notes – 3.50% due 2024
Debt Instrument [Line Items]
Long-term debt	$ 597	597
Interest rate	3.50%
Senior notes – 3.875% due 2024
Debt Instrument [Line Items]
Long-term debt	$ 994	0
Interest rate	3.875%
Senior notes – 3.50% due 2025
Debt Instrument [Line Items]
Long-term debt	$ 497	496
Interest rate	3.50%
Senior notes – 1.349% due 2026
Debt Instrument [Line Items]
Long-term debt	$ 609	0
Interest rate	1.349%
Senior notes – 3.75% due 2026
Debt Instrument [Line Items]
Long-term debt	$ 597	596
Interest rate	3.75%
Senior notes – 4.375% due 2029
Debt Instrument [Line Items]
Long-term debt	$ 1,499	0
Interest rate	4.375%
Senior notes – 1.979% due 2030
Debt Instrument [Line Items]
Long-term debt	$ 607	0
Interest rate	1.979%
Senior notes – 5.875% due 2033
Debt Instrument [Line Items]
Long-term debt	$ 298	297
Interest rate	5.875%
Senior notes – 4.75% due 2039
Debt Instrument [Line Items]
Long-term debt	$ 494	0
Interest rate	4.75%
Senior notes – 4.35% due 2047
Debt Instrument [Line Items]
Long-term debt	$ 492	492
Interest rate	4.35%
Senior notes – 4.20% due 2048
Debt Instrument [Line Items]
Long-term debt	$ 592	592
Interest rate	4.20%		4.20%
Senior notes – 4.90% due 2049
Debt Instrument [Line Items]
Long-term debt	$ 1,237	0
Interest rate	4.90%
Mortgage – 5.70% due 2035
Debt Instrument [Line Items]
Long-term debt	$ 345	358
Interest rate	5.70%
Other
Debt Instrument [Line Items]
Long-term debt	$ 7	$ 4