Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Level Input And Input Definitions

Level inputs are as follows:

 

Level Input:	Input Definition:
Level I	Inputs are unadjusted, quoted prices for identical assets or liabilities in active markets at the measurement date.
Level II	Inputs other than quoted prices included in Level I that are observable for the asset or liability through corroboration with market data at the measurement date.
Level III	Unobservable inputs that reflect management's best estimate of what market participants would use in pricing the asset or liability at the measurement date.

Fair Value Measurements By Level For Assets Measured At Fair Value On A Recurring Basis

The following table summarizes fair value measurements by level at December 31, 2019, for assets and liabilities measured at fair value on a recurring basis ($ in millions):  

	Level I		Level II		Level III		Total
Assets
Cash and cash equivalents	$	12,123	$	—	$	—	$	12,123
Investments available for sale:
U.S. Treasury securities and obligations of U.S. government corporations and agencies	$	73	$	—	$	—	$	73
Corporate securities	—		3,713		—		3,713
Municipal securities	—		2,379		—		2,379
Asset-backed securities	—		744		—		744
Residential mortgage-backed securities	—		471		—		471
Commercial mortgage-backed securities	—		388		—		388
Total investments	$	73	$	7,695	$	—	$	7,768
Restricted deposits available for sale:
Cash and cash equivalents	$	8	$	—	$	—	$	8
Certificates of deposit	—		482		—		482
Corporate securities	—		20		—		20
Municipal securities	—		9		—		9
U.S. Treasury securities and obligations of U.S. government corporations and agencies	139		—		—		139
Total restricted deposits	$	147	$	511	$	—	$	658
Other long-term assets:
Interest rate swap agreements	$	—	$	10	$	—	$	10
Total other long-term assets	$	—	$	10	$	—	$	10
Total assets at fair value	$	12,343	$	8,216	$	—	$	20,559
Liabilities
Other long-term liabilities:
Interest rate swap agreements	$	—	$	11	$	—	$	11
Total liabilities at fair value	$	—	$	11	$	—	$	11

The following table summarizes fair value measurements by level at December 31, 2018, for assets and liabilities measured at fair value on a recurring basis ($ in millions):

	Level I		Level II		Level III		Total
Assets
Cash and cash equivalents	$	5,342	$	—	$	—	$	5,342
Investments available for sale:
U.S. Treasury securities and obligations of U.S. government corporations and agencies	$	247	$	—	$	—	$	247
Corporate securities	—		3,146		—		3,146
Municipal securities	—		2,187		—		2,187
Asset-backed securities	—		683		—		683
Residential mortgage-backed securities	—		444		—		444
Commercial mortgage-backed securities	—		361		—		361
Total investments	$	247	$	6,821	$	—	$	7,068
Restricted deposits available for sale:
Cash and cash equivalents	$	8	$	—	$	—	$	8
Certificates of deposit	—		433		—		433
U.S. Treasury securities and obligations of U.S. government corporations and agencies	114		—		—		114
Total restricted deposits	$	122	$	433	$	—	$	555
Total assets at fair value	$	5,711	$	7,254	$	—	$	12,965
Liabilities
Other long-term liabilities:
Interest rate swap agreements	$	—	$	95	$	—	$	95
Total liabilities at fair value	$	—	$	95	$	—	$	95