Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions		12 Months Ended
Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	May 18, 2016	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,200
Other notes		$ 163	$ 300
Total debt		9,952	9,964
Two Point Two Five Percent due on June 15, 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Debt Instrument, Face Amount	$ 400
Debt Instrument, Maturity Date	Jun. 15, 2026
Three Point Three Seven Five Percent due June 15, 2046 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Debt Instrument, Face Amount	$ 400
Debt Instrument, Maturity Date	Jun. 15, 2046
3-month USD LIBOR plus 12.5 basis points due 2017 [Member]
Debt Instrument [Line Items]
Unsecured debt securities		250	250
0.95% - 4.88% due through 2046 [Member]
Debt Instrument [Line Items]
Unsecured debt securities		$ 5,250	5,075
Debt Instrument, Maturity Date		Dec. 15, 2046
5.88% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities		$ 2,383	2,381
Debt Instrument, Maturity Date		Dec. 31, 2043
7.25% – 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities		$ 1,641	1,645
Debt Instrument, Maturity Date		Dec. 31, 2043
6.98% - 7.38% notes due through 2021 [Member]
Debt Instrument [Line Items]
Non-recourse debt and notes		$ 127	163
Debt Instrument, Maturity Date		Dec. 31, 2021
Due Through Two Thousand Twenty-four [Member]
Debt Instrument [Line Items]
Capital lease obligations		$ 138	$ 150
Debt Instrument, Maturity Date		Dec. 31, 2024
Minimum [Member] \| 0.95% - 4.88% due through 2046 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		0.95%
Minimum [Member] \| 5.88% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.88%
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 2046 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.88%
Maximum [Member] \| 5.88% - 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%