Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 10	$ 13
Common stock, shares authorized (in shares)	1,200,000,000	1,200,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Issued	1,043,050
Preferred Stock, Shares Authorized	50,000,000
Accounts receivable, net of allowance for doubtful accounts of $10 and $13, respectively	$ 10	$ 13
Other Current Assets, Allowance	0
Other intangible assets, net of accumulated amortization of $365 and $330, respectively	365	330
Other Noncurrent Assets, Allowance	$ 21	$ 21
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	818,662,357	818,398,654
Common stock, shares outstanding (in shares)	666,329,509	665,370,128
Treasury stock, shares (in shares)	152,332,848	153,028,526
Variable Interest Entity [Line Items]
Non Recourse Debt Current	$ 1,345	$ 1,430
Non-recourse debt, including $3,953 and $3,918, respectively, related to variable interest entities	15,290	15,005
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Non Recourse Debt Current	337	336
Non-recourse debt, including $3,953 and $3,918, respectively, related to variable interest entities	$ 3,953	$ 3,918