Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Millions				6 Months Ended		12 Months Ended
	Jun. 14, 2017	Apr. 26, 2017	Jan. 23, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Short-term borrowings:
Total short-term borrowings				$ 85		$ 242
Unamortized deferred financing costs				(4)		(2)
Current portion of long-term borrowings:
Total current portion of long-term borrowings				189		116
Other arrangements and capital lease obligations				124		116
Total short-term and current portion of long-term borrowings				274		358
Long-term borrowings:
Total Long-term borrowings				18,033		18,131
Unamortized discount and unamortized deferred financing costs				(143)		(154)
Other arrangements and capital lease obligations				288		215
Total Borrowings				18,307		18,489
Long-term borrowings				18,600		18,800
Proceeds from issuance of long-term debt				3,548	$ 2,377
Secured debt | Senior secured term loan facility due March 2021 at LIBOR and euro LIBOR plus 3.0% or, solely with respect to U.S. dollar-denominated term loans, a base rate plus 2.0%
Long-term borrowings:
Total Long-term borrowings				0		$ 4,379
Secured debt | Senior secured term loan facility due March 2021 at LIBOR and euro LIBOR plus 3.0% or, solely with respect to U.S. dollar-denominated term loans, a base rate plus 2.0% | Euro LIBOR
Long-term borrowings:
Basis spread on variable rate (as a percent)						3.00%
Secured debt | Senior secured term loan facility due March 2021 at LIBOR and euro LIBOR plus 3.0% or, solely with respect to U.S. dollar-denominated term loans, a base rate plus 2.0% | Base Rate
Long-term borrowings:
Basis spread on variable rate (as a percent)						2.00%
Secured debt | Senior secured term loan facility due July 2022 at LIBOR plus 3.0% or a base rate plus 2.0%, or solely with respect to euro-denominated term loans, euro LIBOR plus 3.25%
Long-term borrowings:
Total Long-term borrowings				0		$ 3,583
Proceeds from issuance of long-term debt	$ 1,000
Secured debt | Senior secured term loan facility due July 2022 at LIBOR plus 3.0% or a base rate plus 2.0%, or solely with respect to euro-denominated term loans, euro LIBOR plus 3.25% | LIBOR
Long-term borrowings:
Basis spread on variable rate (as a percent)						3.00%
Secured debt | Senior secured term loan facility due July 2022 at LIBOR plus 3.0% or a base rate plus 2.0%, or solely with respect to euro-denominated term loans, euro LIBOR plus 3.25% | Euro LIBOR
Long-term borrowings:
Basis spread on variable rate (as a percent)						3.25%
Secured debt | Senior secured term loan facility due July 2022 at LIBOR plus 3.0% or a base rate plus 2.0%, or solely with respect to euro-denominated term loans, euro LIBOR plus 3.25% | Base Rate
Long-term borrowings:
Basis spread on variable rate (as a percent)						2.00%
Secured debt | Senior secured term loan facility due April 2024 at LIBOR plus 2.5% or a base rate plus 1.5%
Long-term borrowings:
Total Long-term borrowings				$ 4,217		$ 0
Proceeds from issuance of long-term debt		$ 4,200
Secured debt | Senior secured term loan facility due April 2024 at LIBOR plus 2.5% or a base rate plus 1.5% | LIBOR
Long-term borrowings:
Basis spread on variable rate (as a percent)		2.50%		2.50%
Secured debt | Senior secured term loan facility due April 2024 at LIBOR plus 2.5% or a base rate plus 1.5% | Base Rate
Long-term borrowings:
Basis spread on variable rate (as a percent)		1.50%		1.50%
Secured debt | Senior secured term loan facility due July 2022 at LIBOR plus 2.25% or a base rate plus 1.25%
Long-term borrowings:
Total Long-term borrowings				$ 3,758		0
Proceeds from issuance of long-term debt	$ 3,800
Secured debt | Senior secured term loan facility due July 2022 at LIBOR plus 2.25% or a base rate plus 1.25% | LIBOR
Long-term borrowings:
Basis spread on variable rate (as a percent)	2.25%			2.25%
Secured debt | Senior secured term loan facility due July 2022 at LIBOR plus 2.25% or a base rate plus 1.25% | Base Rate
Long-term borrowings:
Basis spread on variable rate (as a percent)	1.25%			1.25%
Secured debt | Senior secured term loan facility due June 2020 at LIBOR plus 2.0% or a base rate plus 1.0%
Current portion of long-term borrowings:
Total current portion of long-term borrowings				$ 65		0
Long-term borrowings:
Total Long-term borrowings				$ 1,203		0
Secured debt | Senior secured term loan facility due June 2020 at LIBOR plus 2.0% or a base rate plus 1.0% | LIBOR
Long-term borrowings:
Basis spread on variable rate (as a percent)			2.00%	2.00%
Secured debt | Senior secured term loan facility due June 2020 at LIBOR plus 2.0% or a base rate plus 1.0% | Base Rate
Long-term borrowings:
Basis spread on variable rate (as a percent)			1.00%	1.00%
Secured debt | 6.75% Senior secured first lien notes due 2020
Long-term borrowings:
Total Long-term borrowings				$ 0		$ 1,398
Interest rate						6.75%
Secured debt | 5.375% Senior secured first lien notes due 2023
Long-term borrowings:
Total Long-term borrowings				$ 1,210		$ 1,210
Interest rate				5.375%
Secured debt | 5.0% Senior secured first lien notes due 2024
Long-term borrowings:
Total Long-term borrowings				$ 1,900		1,900
Interest rate				5.00%
Secured debt | 5.75% Senior secured second lien notes due 2024
Long-term borrowings:
Total Long-term borrowings				$ 2,200		2,200
Interest rate				5.75%
Unsecured debt | 7.0% Senior unsecured notes due 2023
Long-term borrowings:
Total Long-term borrowings				$ 3,400		3,400
Interest rate				7.00%
Foreign lines of credit and other arrangements
Short-term borrowings:
Total short-term borrowings				$ 89		84
Receivable securitized loan at LIBOR plus 150 basis points or a base rate equal to the highest of (i) the applicable lender's prime rate, or (ii) the federal funds rate plus 0.50%
Short-term borrowings:
Total short-term borrowings				$ 0		$ 160
Receivable securitized loan at LIBOR plus 150 basis points or a base rate equal to the highest of (i) the applicable lender's prime rate, or (ii) the federal funds rate plus 0.50% | LIBOR
Long-term borrowings:
Basis spread on variable rate (as a percent)						1.50%
Receivable securitized loan at LIBOR plus 150 basis points or a base rate equal to the highest of (i) the applicable lender's prime rate, or (ii) the federal funds rate plus 0.50% | Federal Funds Rate
Long-term borrowings:
Basis spread on variable rate (as a percent)						0.50%