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Investments (Tables)
 9 Months Ended
Sep. 30, 2020
Short-Term and Long-Term Investments [Table Text Block]
A summary of debt securities by major security type is as follows:
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
September 30, 2020
Debt securities - available-for-sale:
U.S. government and agency obligations$3,374 $160 $— $3,534 
State and municipal obligations6,311 377 (4)6,684 
Corporate obligations18,461 778 (35)19,204 
U.S. agency mortgage-backed securities6,523 270 (3)6,790 
Non-U.S. agency mortgage-backed securities2,033 98 (6)2,125 
Total debt securities - available-for-sale36,702 1,683 (48)38,337 
Debt securities - held-to-maturity:
U.S. government and agency obligations422 7 — 429 
State and municipal obligations31 2 — 33 
Corporate obligations245 1 — 246 
Total debt securities - held-to-maturity698 10 — 708 
Total debt securities$37,400 $1,693 $(48)$39,045 
December 31, 2019
Debt securities - available-for-sale:
U.S. government and agency obligations$3,502 $55 $(4)$3,553 
State and municipal obligations5,680 251 (5)5,926 
Corporate obligations17,910 343 (11)18,242 
U.S. agency mortgage-backed securities6,425 109 (6)6,528 
Non-U.S. agency mortgage-backed securities1,811 37 (3)1,845 
Total debt securities - available-for-sale35,328 795 (29)36,094 
Debt securities - held-to-maturity:
U.S. government and agency obligations402 2 — 404 
State and municipal obligations32 2 — 34 
Corporate obligations538 — (1)537 
Total debt securities - held-to-maturity972 4 (1)975 
Total debt securities$36,300 $799 $(30)$37,069 
Investments by Contractual Maturity [Table Text Block]
The amortized cost and fair value of debt securities as of September 30, 2020, by contractual maturity, were as follows:
Available-for-SaleHeld-to-Maturity
(in millions)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$3,388 $3,407 $400 $401 
Due after one year through five years11,253 11,678 246 252 
Due after five years through ten years9,179 9,826 30 31 
Due after ten years4,326 4,511 22 24 
U.S. agency mortgage-backed securities6,523 6,790 — — 
Non-U.S. agency mortgage-backed securities2,033 2,125 — — 
Total debt securities$36,702 $38,337 $698 $708 
Fair Value of Available-for-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time that Individual Securities have been in a Continuous Unrealized Loss Position [Table Text Block]
The fair value of available-for-sale debt securities with gross unrealized losses by major security type and length of time that individual securities have been in a continuous unrealized loss position were as follows:
 Less Than 12 Months12 Months or Greater Total
(in millions)Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
September 30, 2020
Debt securities - available-for-sale:
State and municipal obligations$366 $(4)$— $— $366 $(4)
Corporate obligations2,314 (30)400 (5)2,714 (35)
U.S. agency mortgage-backed securities687 (3)— — 687 (3)
Non-U.S. agency mortgage-backed securities
278 (3)55 (3)333 (6)
Total debt securities - available-for-sale$3,645 $(40)$455 $(8)$4,100 $(48)
December 31, 2019
Debt securities - available-for-sale:
U.S. government and agency obligations
$616 $(4)$— $— $616 $(4)
State and municipal obligations440 (5)— — 440 (5)
Corporate obligations1,903 (7)740 (4)2,643 (11)
U.S. agency mortgage-backed securities657 (3)333 (3)990 (6)
Non-U.S. agency mortgage-backed securities
406 (3)— — 406 (3)
Total debt securities - available-for-sale$4,022 $(22)$1,073 $(7)$5,095 $(29)