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Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 3,500	$ 1,500	$ 5,500
Commercial paper				6,109	$ 1,895
Other notes				144	170
Total debt				27,302	13,847
Proceeds from Debt, Net of Issuance Costs	$ 5,442	$ 3,454	$ 1,451
0.95% - 4.88% due through 2048 [Member]
Debt Instrument [Line Items]
Unsecured debt securities				$ 17,404	7,538
Debt Instrument, Maturity Date				Dec. 31, 2059
5.80% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities				$ 1,740	2,388
Debt Instrument, Maturity Date				Dec. 31, 2043
7.25% – 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities				$ 1,639	$ 1,638
Debt Instrument, Maturity Date				Dec. 31, 2043
Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time				2.20%	2.50%
6.98% - 7.38% notes due through 2021 [Member]
Debt Instrument [Line Items]
Non-recourse debt and notes				$ 37	$ 62
Debt Instrument, Maturity Date				Dec. 31, 2021
Due Through Two Thousand Thirty-four [Member]
Debt Instrument [Line Items]
Capital lease obligations				$ 229	$ 156
Debt Instrument, Maturity Date				Dec. 31, 2044
Minimum [Member] \| 0.95% - 4.88% due through 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				1.65%
Minimum [Member] \| 5.80% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.80%
Minimum [Member] \| 7.25% – 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				7.25%
Minimum [Member] \| 6.98% - 7.38% notes due through 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.98%
Maximum [Member] \| 0.95% - 4.88% due through 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.88%
Maximum [Member] \| 5.80% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.88%
Maximum [Member] \| 7.25% – 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				8.75%
Maximum [Member] \| 6.98% - 7.38% notes due through 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				7.38%