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Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Commercial paper		$ 6,109
Other notes	$ 172	144
Debt and Lease Obligation	63,583	$ 27,302
Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.20%
6.98% - 7.38% notes due through 2021 [Member]
Debt Instrument [Line Items]
Non-recourse debt and notes	15	$ 37
Due Through Two Thousand Thirty-four [Member]
Debt Instrument [Line Items]
Capital lease obligations	203	229
1.45% - 3.20% due through 2030 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	10,645	8,600
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	9,555	7,073
3.95% - 5.15% due through 2059 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	13,917	1,731
5.71% - 6.63% due through 2060 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	13,005	1,129
6.88% - 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	$ 2,252	$ 2,250
6.98% due through 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.98%
Minimum [Member] \| 0.95% - 4.88% due through 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.45%
Minimum [Member] \| 5.80% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.95%
Minimum [Member] \| 7.25% – 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.88%
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] \| 5.71% - 6.63% due through 2060 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.71%
Maximum [Member] \| 0.95% - 4.88% due through 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.20%
Maximum [Member] \| 5.80% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.15%
Maximum [Member] \| 7.25% – 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.75%
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] \| 5.71% - 6.63% due through 2060 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.63%