Employee Retirement Plans and Incentive Compensation Plans (Amounts recognized in AOCI) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Cash Balance Plan
Defined Benefit Plan Disclosure [Line Items]
Net loss/(gain)	$ 14	$ 17
Non-Qualified Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Net loss/(gain)	1	1
Post-retirement Health Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Net loss/(gain)	$ (1)	$ (1)

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580

Name:	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant