Fair Value (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial Assets and Liabilities, Measured at Fair Value Recurring Basis [Table Text Block]

The following table presents a summary of fair value measurements by level and carrying values for items measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:

(in millions)	Quoted Prices in Active Markets (Level 1)			Other Observable Inputs (Level 2)			Unobservable Inputs (Level 3)			Total Fair and Carrying Value
March 31, 2020
Cash and cash equivalents	$	21,450		$	119		$	—		$	21,569
Debt securities - available-for-sale:
U.S. government and agency obligations	3,143			185			—			3,328
State and municipal obligations	—			5,918			—			5,918
Corporate obligations	59			17,385			250			17,694
U.S. agency mortgage-backed securities	—			6,768			—			6,768
Non-U.S. agency mortgage-backed securities	—			1,924			—			1,924
Total debt securities - available-for-sale	3,202			32,180			250			35,632
Equity securities	1,394			19			—			1,413
Assets under management	937			1,890			39			2,866
Total assets at fair value	$	26,983		$	34,208		$	289		$	61,480
Percentage of total assets at fair value	44		%	56		%	—		%	100		%
December 31, 2019
Cash and cash equivalents	$	10,837		$	148		$	—		$	10,985
Debt securities - available-for-sale:
U.S. government and agency obligations	3,369			184			—			3,553
State and municipal obligations	—			5,926			—			5,926
Corporate obligations	70			17,923			249			18,242
U.S. agency mortgage-backed securities	—			6,528			—			6,528
Non-U.S. agency mortgage-backed securities	—			1,845			—			1,845
Total debt securities - available-for-sale	3,439			32,406			249			36,094
Equity securities	1,734			22			—			1,756
Assets under management	1,123			1,918			35			3,076
Total assets at fair value	$	17,133		$	34,494		$	284		$	51,911
Percentage of total assets at fair value	33		%	66		%	1		%	100		%

Fair Value Measurements, Nonrecurring [Table Text Block]

The following table presents a summary of fair value measurements by level and carrying values for certain financial instruments not measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:

(in millions)	Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Total Fair Value		Total Carrying Value
March 31, 2020
Debt securities - held-to-maturity	$	556	$	91	$	88	$	735	$	725
Long-term debt and other financing obligations	$	—	$	45,272	$	—	$	45,272	$	40,394
December 31, 2019
Debt securities - held-to-maturity	$	541	$	181	$	253	$	975	$	972
Long-term debt and other financing obligations	$	—	$	45,078	$	—	$	45,078	$	40,278