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Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	12 Months Ended
Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Feb. 16, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 900
Commercial Paper	$ 600
Other notes	135		163
Total debt	11,117		9,952
0.95% - 4.88% due through 2047 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	$ 6,127		5,250
Debt Instrument, Maturity Date	Mar. 01, 2047
5.80% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	$ 2,386		2,383
Debt Instrument, Maturity Date	Dec. 31, 2043
7.25% – 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	$ 1,637		1,641
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	1.40%
3-month USD LIBOR plus 12.5 basis points due 2017 [Member]
Debt Instrument [Line Items]
Unsecured debt securities			250
6.98% - 7.38% notes due through 2021 [Member]
Debt Instrument [Line Items]
Non-recourse debt and notes	$ 94		127
Debt Instrument, Maturity Date	Dec. 31, 2021
Due Through Two Thousand Thirty-four [Member]
Debt Instrument [Line Items]
Capital lease obligations	$ 138		$ 138
Debt Instrument, Maturity Date	Dec. 31, 2034
Minimum [Member] \| 0.95% - 4.88% due through 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.95%
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 2047 [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%