Financial Instruments - Foreign Exchange Risk Management (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	$ 1,091
Average maturity of foreign exchange hedging contracts - within three months (percent)	82.00%
Average maturity of foreign exchange hedging contracts - within three months and six months (percent)	9.00%
Average maturity of foreign exchange hedging contracts - within six and twelve months (percent)	9.00%
Derivative assets (liabilities), at fair value, net	$ (5)	$ 11
Japanese Yen/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	369
Japanese Yen/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	264
U.S. Dollar/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	122
Euro/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	71
Euro/U.K. Pound Sterling
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	64
U.S. Dollar/Canadian Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	50
Euro/Danish Krone
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	29
U.K. Pound Sterling/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	27
U.S. Dollar/Russian Ruble
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	22
U.S. Dollar/Japanese Yen
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	14
Euro/Swiss Franc
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	12
U.S. Dollar/Israeli Shekel
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	9
All Other
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative notional value	38
Foreign exchange contract
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	(6)
Foreign exchange contract | Japanese Yen/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	(2)
Foreign exchange contract | Japanese Yen/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	(3)
Foreign exchange contract | U.S. Dollar/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | Euro/U.S. Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | Euro/U.K. Pound Sterling
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | U.S. Dollar/Canadian Dollar
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	(1)
Foreign exchange contract | Euro/Danish Krone
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | U.K. Pound Sterling/Euro
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | U.S. Dollar/Russian Ruble
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	(1)
Foreign exchange contract | U.S. Dollar/Japanese Yen
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | Euro/Swiss Franc
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | U.S. Dollar/Israeli Shekel
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	0
Foreign exchange contract | All Other
Summary of Foreign Exchange Hedging Positions [Abstract]
Derivative, fair value, net	$ 1