Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 20	$ 20
Other Current Assets, Allowance	2	0
Other intangible assets, accumulated amortization	310	307
Loans and Leases Receivable, Allowance	32	0
Other Noncurrent Assets, Allowance	$ 29	$ 0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,200,000,000	1,200,000,000
Common stock, shares issued (in shares)	817,964,353	817,843,916
Common stock, shares outstanding (in shares)	664,907,475	663,952,656
Treasury stock, shares (in shares)	153,056,878	153,891,260
Variable Interest Entity [Line Items]
Non Recourse Debt Non Current	$ 15,360	$ 14,914
Non-recourse debt, including $331 and $337, respectively, related to variable interest entities	1,725	1,868
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Non Recourse Debt Non Current	4,074	3,872
Non-recourse debt, including $331 and $337, respectively, related to variable interest entities	$ 331	$ 337