Derivatives, Fair Value Hedging Basis Adjustment (Details) - Fair Value Hedging [Member] - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Hedged Items Currently Designated [Member] \| Debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	$ 39,478	$ 37,857
Hedged Asset, Fair Value Hedge, Cumulative Basis Adjustments	1,226	(157)
Hedged Items Currently Designated [Member] \| Mortgage loans held for sale [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	852	448
Hedged Asset, Fair Value Hedge, Cumulative Basis Adjustments	16	7
Hedged Items Currently Designated [Member] \| Deposits [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	(56,584)	(56,535)
Hedged Liability, Fair Value Hedge, Cumulative Basis Adjustments	(425)	115
Hedged Items Currently Designated [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	(115,922)	(104,341)
Hedged Liability, Fair Value Hedge, Cumulative Basis Adjustments	(5,999)	(742)
Not designated as hedging instrument [Member] \| Debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	5,704	4,938
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Basis Adjustments	110	238
Not designated as hedging instrument [Member] \| Mortgage loans held for sale [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	388	0
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Basis Adjustments	4	0
Not designated as hedging instrument [Member] \| Deposits [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	0	0
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Basis Adjustments	0	0
Not designated as hedging instrument [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	(25,638)	(25,539)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Basis Adjustments	270	366
Foreign exchange contract [Member] \| Hedged Items Currently Designated [Member] \| Debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of Assets	1,500	1,600
Foreign exchange contract [Member] \| Hedged Items Currently Designated [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Carrying Amount of (Liabilities)	(5,700)	(6,300)
Re-designated as hedging instrument [Member] \| Debt securities [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Hedged Asset, Fair Value Hedge, Cumulative Basis Adjustments	828	1,400
Re-designated as hedging instrument [Member] \| Long-term debt [Member]
Fair Value Hedging Basis Adjustment [Abstract]
Hedged Liability, Fair Value Hedge, Cumulative Basis Adjustments	$ 99	$ 66

Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959

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- Definition

Amount of asset hedged in fair value hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959

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- Definition

Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959

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- Definition

Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk, remaining after discontinued hedge.

+ References

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- Definition

Amount of liability hedged in fair value hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959

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- Definition

Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EE
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959

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- Definition

Fair Value Hedging Basis Adjustment [Abstract]

+ References

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