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Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Other notes	$ 93	$ 187
Debt and Lease Obligation	$ 58,102	$ 63,583
Due Through Two Thousand Thirty-four [Member]
Debt Instrument [Line Items]
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Short-term debt and current portion of long-term debt, Long-term debt	Short-term debt and current portion of long-term debt, Long-term debt
1.17% - 2.50% due through 2026 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	$ 12,404	$ 3,656
2.60% - 3.20% due through 2030 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	7,001	6,989
Eurodollar plus 0.75% - 1.25% due 2022 [Member]
Debt Instrument [Line Items]
Unsecured debt securities		13,819
3.25% - 3.90% due through 2059 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	9,570	9,555
3.95% - 5.15% due through 2059 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	13,993	13,917
5.71% - 6.63% due through 2060 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	13,008	13,005
6.88% - 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	$ 1,853	$ 2,252
Minimum [Member] \| 1.17% - 2.50% due through 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.17%
Minimum [Member] \| 2.60% - 3.20% due through 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.60%
Minimum [Member] \| Eurodollar plus 0.75% - 1.25% due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.75%
Minimum [Member] \| 3.25% - 3.90% due through 2059 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Minimum [Member] \| 3.95% - 5.15% due through 2059 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.95%
Minimum [Member] \| 5.71% - 6.63% due through 2060 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.71%
Minimum [Member] \| 6.88% - 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.88%
Maximum [Member] \| 1.17% - 2.50% due through 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Maximum [Member] \| 2.60% - 3.20% due through 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.20%
Maximum [Member] \| Eurodollar plus 0.75% - 1.25% due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.25%
Maximum [Member] \| 3.25% - 3.90% due through 2059 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.90%
Maximum [Member] \| 3.95% - 5.15% due through 2059 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.15%
Maximum [Member] \| 5.71% - 6.63% due through 2060 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.63%
Maximum [Member] \| 6.88% - 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.75%