Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Debt - Total Debt Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Aug. 13, 2018
Debt Instrument [Line Items]
Commercial Paper	$ 1,311	$ 951
Other short-term debt	10	0
Short-term debt	2,569	951
Long-term debt:
Total long-term debt	5,250	6,490
Total debt	7,819	7,441
Senior Notes \| Other short-term debt
Long-term debt:
Interest rate, stated percentage			2.50%
Senior Notes \| 2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)
Debt Instrument [Line Items]
Short-term debt	1,248	0
Long-term debt:
Senior notes	$ 0	1,246
Interest rate, stated percentage	2.75%
Senior Notes \| 2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)
Long-term debt:
Senior notes	$ 497	496
Interest rate, stated percentage	2.35%
Senior Notes \| 2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)
Long-term debt:
Senior notes	$ 398	397
Interest rate, stated percentage	3.45%		3.45%
Senior Notes \| 2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)
Long-term debt:
Senior notes	$ 794	793
Interest rate, stated percentage	4.00%
Senior Notes \| 2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)
Long-term debt:
Senior notes	$ 1,244	1,243
Interest rate, stated percentage	3.75%
Senior Notes \| 2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)
Long-term debt:
Senior notes	$ 496	496
Interest rate, stated percentage	3.10%
Senior Notes \| 2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)
Long-term debt:
Senior notes	$ 592	591
Interest rate, stated percentage	3.75%		3.75%
Senior Notes \| 2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)
Long-term debt:
Senior notes	$ 1,229	$ 1,228
Interest rate, stated percentage	4.25%		4.25%