The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets, Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Six months ended June 30, 2019 (actual)	$ 27	$ 265	$ 55	$ 530
Estimate for the remainder of 2019	191		191
Estimate for year ended December 31,
2020	344		344
2021	294		294
2022	256		256
2023	218		218
2024	182		182
Finite lived intangible assets [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Six months ended June 30, 2019 (actual)			194
Amortized MSRs [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Six months ended June 30, 2019 (actual)			135
Estimate for the remainder of 2019	136		136
Estimate for year ended December 31,
2020	249		249
2021	213		213
2022	188		188
2023	159		159
2024	134		134
Customer relationship and other amortized intangibles [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Six months ended June 30, 2019 (actual)			59
Estimate for the remainder of 2019	55		55
Estimate for year ended December 31,
2020	95		95
2021	81		81
2022	68		68
2023	59		59
2024	$ 48		$ 48