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Contingencies (Loss Contingencies) (Details) $ in Millions		12 Months Ended
		Dec. 31, 2019 USD ($) agreement	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Guarantor Obligations, Term		less than one year to more than 15 years
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 1,226
Number of Agreements | agreement		77
Environmental Remediation Contingency [Domain]
Environmental Contingencies
Liability recorded for projected environmental remediation costs		$ 4		$ 5
Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	[1]	$ 12
Number of Agreements	[1]	1
Guarantee Obligations [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 853
Number of Agreements		37
Litigation
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable		$ 55		$ 53
Parent Company [Member] | Guarantees [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 865
Number of Agreements		38
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 342
Number of Agreements		11
Secured Debt [Member] | Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 19
Number of Agreements		28
Minimum [Member] | Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		1.00%
Minimum [Member] | Guarantee Obligations [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss		$ 0
Minimum [Member] | Litigation
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss		75
Minimum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss		1	$ 1
Minimum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss		$ 0
Maximum [Member] | Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		3.00%
Maximum [Member] | Environmental Remediation Contingency [Domain]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss		$ 15
Maximum [Member] | Indemnification Agreement [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss	[1]	12
Maximum [Member] | Guarantee Obligations [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss		157
Maximum [Member] | Litigation
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss		503
Maximum [Member] | Unsecured Debt [Member] | Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss		296	296
Maximum [Member] | Secured Debt [Member] | Financial Standby Letter of Credit [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss		$ 4	$ 4
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